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Look your pixelmon's stats, it should tell you something like huge, giant, enormous, small, runt, pygmy, ordinary... That's its growth, and that's the reason some aren't the same size as the game's pokedex says.
I only give advice, take it or leave it.
I did my job, now do yours, a choice.
I'm weird, so don't take me too seriously, I'd feel bad for you.
Unless I say it, I never mean harm, it'd make me look bad if you think so.
All pokemon also grow a small amount each time they level up