From Bulbapedia, the community-driven Pokémon encyclopedia.
Travel Speed (Japanese: いどうそくど Travel Speed), referred to as Movement Speed prior to Pokémon Mystery Dungeon: Gates to Infinity, is a mechanic of the Pokémon Mystery Dungeon series that governs the number of actions (such as moving, attacking, or using an item) a Pokémon may take in a given turn.
Normally, Pokémon may take only one action in a given turn; however, Pokémon may have their Travel Speeds boosted or dropped. A Pokémon may take one additional action per turn for each boost in Travel Speed. Conversely, a Pokémon can only take one action every two turns if there is a drop in Travel Speed.
Prior to Gates to Infinity, each Pokémon may have up to five simultaneous boosts in Movement Speed and five simultaneous drops in Movement Speed. This does not count permanent boosts such as from snowy weather (for Ice-type Pokémon), the Ability Speed Boost, the Time Tripper IQ skill, or Deoxys Speed Forme's boost. Similarly, as long as a Pokémon is Paralyzed, it suffers from a permanent speed drop, which does not count against the five. Boosts in Movement Speed last anywhere between 8-10 turns, while drops in Movement Speed last anywhere between 6-8 turns.
In Pokémon Super Mystery Dungeon, each Pokémon may have up to four simultaneous boosts and only one drop in Travel Speed. All boosts or drops in Travel Speed, such as from Speed Boost or paralysis, are always temporary. Boosts in Travel Speed now last 6 turns while drops last 5 turns.
A drop in Travel Speed is considered a status condition and not a stat reduction (as there is no speed stat in Mystery Dungeon), and thus can be healed by changing floors and exiting the dungeon. Any change in Travel Speed will not be removed by stepping on a Wonder Tile, and any moves that prevent stat drops or clear them (such as Haze) do not affect Travel Speed.
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