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I remember seeing somewhere saying that Guzma squats during battle to be closer to his bug type pokemon, which I thought was a pretty good reason, fun times
Then we see Kahili, a flying type, squat down and it went down the drain, she'd be putting herself farther away from her birds. Either that or it's just because she looks like a chicken in that position.
Also, I find it funny how they gave Toucannon permanent angry face and made it the ace of permanent bitch face girl.