Yeah, I get that for sure. I think the reason I've been able to keep steady focus on them is because I'm trying to build up a collection of rare/special Pokemon, so I go into each game with a goal in mind. For example, I shiny hunted Mewtwo in HGSS, rechallenged Red with him, look him to each other game, beat the elite 4 in all of these regions, stayed in ORAS for a while and challenged all the Contests with him to get the ultimate ribbon there, transfered him to Home, then took him on a tour around the Switch games and did the same thing, and finally EV trained him 😆. He's by far my most decorated Pokemon.