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This section of the walkthrough will help you defeat the Elite Four and Champion.
Before you challenge the Elite Four...
- Make sure you have a lot of Hyper Potions to heal your Pokémon, as well as a few Max Potions or Full Restores. You may want some Revives as well, and maybe some Ethers or Elixirs. You'll need to heal after every battle, so don't skimp on supplies. Many times hyper potions works same as max potions in terms of healing HP.
- Make sure your Pokémon are Level 56 or higher before challenging the Elite Four. As you probably know, you have to defeat all of them, as well as the Champion, in one shot— if you're defeated, you have to start over.
If you think you're ready, step through the door!
The first Elite Four member is Sidney, who specializes in the Dark type. Bug- and Fighting-type moves will be supereffective against his Pokémon. Bug-type moves will deal four times the normal damage against his Cacturne and Shiftry, as they are both Dark/Grass types. (Note: Heracross is an excellent Pokémon to fight Sidney with.)
Sidney sends out his Mightyena first. It knows Crunch, a strong Dark-type move, Double-Edge, a very powerful Normal-type move, Roar to force your Pokémon to switch, and Sand-Attack, which lowers your Pokémon's Accuracy. Mightyena's best stat is Attack, so watch out for Double-Edge! Crunch is a good move that gets STAB, but Mightyena's Special Attack isn't that great, so don't worry about it that much. Sand-Attack and Roar may get annoying. The best thing to do about Mightyena is to just knock it out as quickly as possible with strong Bug or Fighting attacks. Sidney's Cacturne and Shiftry have a 4x weakness to Bug. Cacturne knows Faint Attack and Needle Arm for attacking, and you'll really need to watch out— it has an excellent Special Attack stat. Leech Seed will drain the health of a Pokémon hit by it, harming you and healing your opponent. Cotton Spore will harshly lower your Speed. You really need to watch out for this thing— hit it with strong Bug-, Fire-, Ice-, or Flying-type attacks and don't mess around. Thankfully, it has low Speed. Sidney's other Dark/Grass type, Shiftry, has slightly lower attacking stats, but it is faster and has more HP. Oddly, it only knows one attacking move— Extrasensory, which is of the Psychic type. Shiftry knows Double Team to boost its evasiveness, Torment to prevent your Pokémon from using the same move twice in a row, and Swagger, which will confuse your Pokémon but also sharply raise their attack. Shiftry shouldn't be too much of a problem; It has the exact same weaknesses as Cacturne, so just get it out of the way. Crawdaunt has a somewhat unusual type combination: Water/Dark. It has a massive Attack stat (which can't be lowered, thanks to its Ability), so do not mess around. It knows Strength, a Normal-type move, and Surf, a strong Water-type attack. (Interestingly, these are both HMs.) Crawdaunt also knows Swords Dance to sharply boost its already deadly Attack stat, and Facade. Facade will double in power from 70 to 140 if you poison, paralyze, or burn Crawdaunt, so don't use moves like Toxic, Thunder Wave, or Will-O-Wisp on it! Crawdaunt is weak to Fighting-, Bug-, Grass-, and Electric-type moves, so use those to get rid of it. Sidney's highest-leveled Pokémon is his Absol, which has even higher Attack than Crawdaunt! It knows Rock Slide, Aerial Ace (this never misses), and Slash to attack, and also has Swords Dance to boost its already incredibly high Attack. Being a pure Dark type, Bug and Fighting moves will take it out. However, keep in mind that Absol has Aerial Ace which is super-effective against both Fighting- and Bug-types! Either take it out in one hit or use a non-Bug- or Fighting-type Pokémon with Bug- or Fighting-type attacks. Basically, the strategy with Sidney is this: Keep attacking and don't mess around with status moves.
Your next opponent, Phoebe, is a specialist of the Ghost type. Normal-type Pokémon are completely immune to Ghost-types moves, while Dark- and Steel-type Pokémon resist Ghost attacks. Ghost types are weak to Ghost- and Dark-type attacks. Don't use Psychic-type Pokémon, as they are weak to Ghost (unless their second type is Steel, as in the case of the Metagross family).
Phoebe sends out her Level 48 Dusclops first. It knows Curse, which will lower its health by half, and causes a Pokémon hit by it to lose 25% of its health every turn until it faints or the battle ends. Dusclops also knows Confuse Ray to Confuse your Pokémon, Protect to block your attacks, and Shadow Punch to attack. Hit Dusclops with a Dark- or Ghost-type move to get it out of your way. it has massive defensive stats, so it might be harder than you expect. Next, Phoebe has two Level 49 Banette, both of which know the powerful Ghost-type attack Shadow Ball. One has Grudge, Will-O-Wisp, and Faint Attack as its other three moves, and the other knows Thunderbolt, Psychic, and Facade. These two aren't especially hard to defeat, although Will-O-Wisp causes a burn if it hits, Grudge can be annoying, and Facade can hit hard due to Banette's high Attack stat. Don't paralyze, poison, or burn either Banette because it's hard to tell which one you're after. Facade doubles in power if the user is affected by a major status condition. An interesting Pokémon you'll have to deal with is Sableye, which has no weakness. It has Double Team to boost its evasiveness, so knock it out as quickly as you can before things get annoying. Any move that isn't Normal, Fighting, Psychic, or Poison will deal normal damage to Sableye, which has stats that aren't the greatest. The most dangerous Pokémon on Phoebe's team is her quite dangerous Level 51 Dusclops. It's hard to knock out due to its massive defensive stats, and it knows very powerful attacks: Ice Beam, Shadow Ball, Rock Slide, and Earthquake. With this one, go all-out with your best Ghost and Dark attacks until you've knocked it out.
Once you've defeated Phoebe, heal up your team and continue on to the next room.
The third Elite Four member, Glacia, uses Ice types. They are weak to Fire, Fighting-, Steel-, and Rock-type moves. Don't use Dragon-, Flying-, Grass-, or Ground types, since they are weak to Ice.
Beware! One of her Glalie knows Explosion which may deal great amount of damage to your Pokémon but the good news is that Glalie will faint. However, Ghost-type Pokémon such as Haunter are not effected by explosion but they are super effected by Crunch and Shadow Ball. Her Sealeo likes to start things off with Hail, which gives you the chance to defeat them in first turn. However, out of all her Pokémon, her biggest challenge is her Walrein which knows Sheer Cold - an OHKO move! Sheer Cold will deal damage as same as your Pokémon's current HP, making ' em instantly faint. However this attack will fail if your Pokémon's level is more than Walrein's level aka 53. If your Pokémon is also at lv. 53 than it has [your Pokémon's level + 30] % chance to hit.
Lv. 50 Sealeo knows Encore which will make your Pokémon use same move turn by turn for some turns.
Lv. 52 Sealeo knows Attract which may not allow your Pokémon to attack if gender differences exist. However, it also knows Double-Edge which does not suits its low attack and also deals recoil damage to it. But Blizzard, which has 120 base power, super suits on it and deals damage as attack with base power of 180 because it receives STAB for this move. Both Glalie are hard to beat because of their counter move usage. Level 50 Glalie is also known to use Light Screen
Walrein has very powerful SP. Attack so Ice Beam can cause your Pokémon super damage. Surf can also be cause of problem. However, Body Slam is not SP. Attack but it can cause paralysis. Walrein also owns one Sitrus Berry. All you have to do is attack without wasting any turn and finish it as early as possible. You can use Fire-type Pokémon so when you got frozen solid you can use your Fire-type moves which makes you free from it. But Sealeo and Walrein have the ability, Thick Fat, and Water as their secondary type which will make Fire moves more ineffective.
The final and toughest Elite Four member is Drake, who trains Dragon-type Pokémon. Dragon and Ice are supereffective against Dragon-type Pokémon.
Drake sends out his Shelgon first, which is a pure Dragon type. It will keep using Protect, so try to avoid using moves low on PP because you'll run out, most likely. You will need to watch out for Double-Edge, a Normal-type move with 120 base power that will not deal recoil damage because of Shelgon's ability. Rock Tomb doesn't deal much damage in general, thankfully, but Dragon Claw has 80 base power and gets STAB, so be careful. Ice-type Pokémon shouldn't have any trouble against Shelgon as long as they watch out for Rock Tomb. Drake's second Pokémon, Altaria (a Dragon/Flying type), also uses Double-Edge but receives recoil damage. It also knows Aerial Ace, a move with only 60 base power that never misses. DragonBreath has only 60 base power also, but has a chance of paralyzing your Pokémon if it hits. Knock Altaria out as quickly as possible because it knows Dragon Dance to boost its Attack and Speed. Now comes a real threat... the Water/Dragon Kingdra. Its only weakness is Dragon, a type that it can easily defeat. It knows SmokeScreen to lower the accuracy of your Pokémon's moves, and like Altaria, it has Dragon Dance. Surf (does massive damage) and Body Slam (has a chance of paralyzing your Pokémon) will really hurt when they hit. It is hard to inflict damage on Kingdra unless you have Dragon-type Pokémon in your party. Don't fool around with stat-boosting when fighting Kingdra— get it out of the way as quickly as possible. The next Pokémon is Flygon, a Ground/Dragon type and yet another Pokémon with a 4x weakness to Ice. All of its moves are powerful attacks, with Earthquake and DragonBreath being especially powerful. The last Pokémon you'll face is Salamance, another Dragon/Flying type. Its stats are as good as those of many Legendary Pokémon, with its Attack stat being particularly high. Its moveset is Rock Slide, Flamethrower, Dragon Claw, and Crunch. All of its moves are deadly, but the most destructive is Dragon Claw. Although Ice is doubly supereffective against this dragon, it has two moves to get rid of Ice types. A good thing to do here is have a Water type that knows Ice Beam— Salamence has no supereffective moves against that type, and many Water types can learn Ice Beam using the TM.
When you defeat Drake, heal up your team and proceed to the Champion's room!
In Ruby and Sapphire, Steven was the Champion. Now, he's been replaced by Wallace, a master of Water-type Pokémon. Four of Wallace's Pokemon can do super-effective damage to Grass-types, so it's time to bring in Electric-types to defeat Wallace. However, keep a Grass-type handy in your party which will help defeat his Whiscash.
Wallace's Wailord starts with Rain Dance. It may be a good idea to have an Electric-type in your team that knows the powerful move Thunder, which has 100% accuracy in heavy rain. This can allow you to take out Wailord, and maybe several of his other Pokemon, easily. Take Wailord out as soon as possible because it knows the powerful move Water Spout, a move which deals more damage the more health Wailord has. As long as the rain is in effect, his Water-type moves will deal twice the normal damage, so take out Wailord as soon as possible. Next, he sends out his Tentacruel. It is a Water/Poison-type so don't use Grass-types against this one. Also watch out for its ability Liquid Ooze: don't use damage absorbing moves like Giga Drain or Leech Seed. Take Tentacruel out with a powerful Electric-type attack, preferably Thunder while the rain is still in effect. Be careful of Toxic, a move which badly poisons your Pokemon, and Hydro Pump, which will deal massive damage in rain. Next, he has Whiscash, a Water/Ground-type Pokemon. Don't use Electric-type attacks on this one, because it will have no effect! The good news is, however, that it is 4x weak to Grass-type attacks so switch to a Grass-type Pokemon and take it out quickly. It has Hyper Beam, an extremely powerful move, Amnesia which raises its Special Defence and make it harder to damage, Surf which will likely be powered up by the rain, and Earthquake which will deal harsh damage. Get Whiscash out of the way with a powerful Grass-type attack. (Note: Tropius is an excellent Pokemon to fight Whiscash as it is a Grass-type and also avoids damage by Earthquake.) Next, he sends out his Ludicolo. It has Leech Seed to drain your Pokemon's health each turn (it can get annoying later on), Giga Drain which steals health, the extremely annoying Double Team which raises its evasiveness and Surf. Try taking it out with a Flying-, Bug- or Poison-type attack before it uses Double Team because it will become extremely annoying. A Pokemon with Aerial Ace should do fine against Ludicolo. Next, he sends out Gyarados, a powerful Water/Flying-type. It knows Earthquake, Hyper Beam, Surf and Dragon Dance, a move which boosts its speed and attack. Fortunately, it is 4x weak to Electric-type attacks, so take it out in one shot before it has a chance to make a move. Finally, his last and most powerful Pokemon, Milotic. It is holding a Sitrus Berry which heals 30HP and may get annoying later on. Do not use Grass-types against it as it knows a powerful Ice-type move, Ice Beam. It knows Toxic to badly poison your Pokemon and Surf. Finally, it knows Recover, a move which restores HP. This will prove annoying, especially since it can use it 20 times. Take Milotic out with a strong Electric-type attack before it can do much.
Now that you've defeated the Elite Four, the ending credits will roll and congratulations, you have completed the game! However, this is not it--there are many other things you can do after defeating the Elite Four.