From Bulbapedia, the community-driven Pokémon encyclopedia.
Erika's Weed Garden is a type deck found in the Gym Challenge Strategy Guide. The deck is classified in the guide as an easy-to-build deck as it contains few rare cards, with the aim that a player of any age or skill level could complete it.
We've used Flower, Mushroom, Seed, Vine, and Weed Pokémon to build a theme deck for Erika. Erika likes plants — a lot! This kind of deck is fun to build. First you pick a theme (in this case, plants), and then try to build a deck using only cards that fit that theme. Try to make some theme decks of your own, and see what you come up with!
To play this theme deck, all you need to do is start putting Pokémon into play! The best Pokémon in "Erika's Weed Garden" is Erika's Vileplume. It can heal damage on itself while it attacks. Erika's Vileplume's Pokémon Power can confuse your opponent's Pokémon whenever they attack. The other plant Pokémon in this deck can make your opponent's Pokémon Asleep, Confused, or Poisoned, which makes this a pretty dangerous garden for your opponent's Pokémon!