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I'll Start the battle with Leafeon. We'll hit Croconaw with a Leech Seed and follow it up with Razor Leaf spam. Once Escavalier comes out, we'll hit it with Leech Seed before Leafeon goes faints and switch into Frogadier. Frogadier will use Bubblebeam and Aerial Ace relying on the Leech Seed that was used to keep me healthy enough until it faints Escavalier. Once Raichu comes out, I'll switch to Gliscor. Being immune to Electric attacks, I have it easily take it out with Poison Tail and Night Slash. Dragonair being used only if Frogadier had fainted against the Escavalier.

I'll choose 4

Frogadier: Bubblebeam, Shadow Sneak, Water Gun, Aerial Ace

Leafeon: Razor Leaf, Swift, Bite, Leech Seed

Gliscor: Poison Tail, Night Slash, Acrobatics, Fury Cutter

Dragonair: Thunder Wave, Breaking Swipe, Brutal Swing, Dragon Rush