I got back into my Pearl version today for the first time in quite a while iirc. I would like to get the National Dex completed on this game some time, so I decided to work on it a bit today. After checking my Pokedex to see what Pokemon I was missing, I went into my PC boxes to find some Pokemon to evolve.
So, I got a few Pokemon and put them in my party with my Hippowdon and Togekiss. I then started fighting trainers for experience. I had a rematch with my rival at the Fight Area and then rematched some trainers on the neighbouring routes. After that, I returned to mainland Sinnoh for some more battles. In the end, I managed to evolve an Ivysaur, Caterpie, Ekans, and Zigzagoon.
My dex is at 311 owned. I'll continue trying to fill it up some time soon hopefully, whenever I have time.