It's amazing how much of a difference a VA makes. I watched Pokemon in English as a kid because I lived in America but now I'm rewatching it in Japanese because I live in Japan and some of the characters I didn't care so much about as a kid are my favorites now because the VA's did such a great job. Jessie/Musashi is literally one of the best characters in the entire show, it's a shame that her VA is known in the West for Evangelion and not Pokemon because her performance in Pokemon is so good! I never really liked Meowth/Nyaas as a kid either but again the Japanese VA did such a good job that I really like the character now. I did like Psyduck/Kodakku as a kid but I somehow like it more now.
Also the dubbing company changed a ton of stuff. There's even entire scenes that I don't remember from the English version, and so far I've watched a few episodes that never got English releases at all. I'm 40 episodes in and I don't remember seeing the Dratini episode, Tentacool episode, or the beach beauty contest episodes when I was a kid.