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I nickname absolutely every Pokemon I catch except for legendaries. Sometimes I plan certain nicknames ahead for certain Pokemon species.
I organize my PC boxes based on type, with appropriate name and wallpaper.
If a Pokemon has a signature move, it's going to be on its final moveset.
I'm really uncomfortable teaching a Pokemon a move it shouldn't be able to use (like a punch move on an armless Pokemon) and usually end up not teaching it to them, even if it's convenient.
Back when TMs were single-use, I simply never used TMs. (I didn't play competitively anyway.)
Every Pokemon in my party has to be on the same level before the Elite 4.
Always save twice.