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I like the stick to balltism, but one personal rule I have is anything on my main, personal team (the one I transfer first each gen and do post-games with) shouldn't be in a plain Pokeball - except my ace, pic related.
I like doing it to show that everyone else is from more recent times, some in the team for the last few years, some just a few months. But he's been there for 15+ years.
