Your ace pokemon

I'm curious as to if any of you have an ace pokemon, and why it's your ace - whether because of an emotional connection, it being really good, or something else.

If you asked me back in gen 8, I probably would've said Luxray, persian, or blastoise. But Sandy Shocks has shown me what a true ace is. Soon as I saw it I knew I wanted one - it's SO COOL. I never hit masterball tier until gen 9, but sandy shocks has kept me in it. It instantly unseated my ampharos and has led my electric team to some crazy dubs all generation. Both pawmot and SS are team constants for me, but SS gets that ace status easily. I fear the day when I have to leave it in home until TPC/GF lets us have paradoxes again.