I always really liked Battle Dome in Emerald, and training up my mentee in the Battle Tower (cloning was fun too). Brief forays aside though I only took them seriously in my last two spurts of Pokémon-playing. 2017 I had a real go at Hoenn Frontier for a couple weeks, maybe got 1 symbol. 2020 saves I think I got to battle the Subway Bosses, then when I picked up Platinum recently I've taken it quite seriously, getting about 30 different Pokémon to Silver Print at Battle Tower, and two teams to Gold. Can't get past battle 50 though and I ran out of patience as I was dual-screening it with a Suits binge and they got to the episode where Meghan left. I will get that 100 streak one day though, I'm determined once I fork over for an over-expensive copy of Pearl and complete my National Pokédex, I'm going for a completed trainer card.