What it does
Terrain Pulse is a weak Normal-type special move with no terrain active — don't bother clicking it in that state. With any terrain up, it flips: the power doubles and the type matches the terrain — Electric Terrain makes it Electric, Grassy makes it Grass, Misty makes it Fairy, Psychic makes it Psychic. Both changes happen at once, same turn.
The type change matters just as much as the power boost. Grassy Terrain Pulse hits Water/Ground/Rock types for super effective damage. Misty Terrain Pulse goes Fairy, meaning it punishes Dragon, Fighting, and Dark types. Psychic Terrain Pulse targets Fighting and Poison. The terrain your partner sets determines what you can actually threaten — the coverage profile is entirely different depending on which terrain you're working under.
Who runs it
Clawitzer (4% usage) is the recorded user in Champions. It has Mega Launcher, which boosts pulse and aura moves — and Terrain Pulse qualifies. Doubled terrain power stacked with Mega Launcher means the effective output is substantially higher than the raw numbers suggest. Clawitzer's Special Attack is solid enough that under the right terrain, Terrain Pulse becomes its strongest attack option.
The 4% usage rate reflects the real constraint: you need a reliable terrain setter on the team, which costs a teambuilding slot. The setup is high-ceiling but high-cost.
How to use it
Your partner sets terrain on turn one, you follow up with Terrain Pulse on the same or next turn — that's the core pattern in doubles. The type you get is locked to whatever terrain is active, so before you click it, check whether the terrain type matches what you need to threaten on the field. Misty Terrain into a Steel type means you're hitting for 0.5× — not what you want.
Tips & strategy
Terrain can be overwritten. If the opponent sets their own terrain, or carries Cloud Nine or Air Lock, your terrain disappears and Terrain Pulse instantly becomes a low-power Normal move. That's a hard counter to this entire gameplan, not a soft one.
Psychic Terrain has a secondary effect worth noting: while it's active, Pokémon on the ground can't be hit by increased priority moves. That can protect your side from Fake Out, but it also means your own priority moves may be blocked in certain matchups. Know the full terrain rules, not just the damage boost.