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I've got 83:20 on Pokemon Pearl, which is the Pokemon game I play the most. I also have ~40 hours on Heart Gold, but I plan to erase the file and start over.
I nearly always use Abomasnow in Pokemon Pearl. His typing is good, in my opinion, as there aren't exactly many Fire types in Sinnoh. He was also quite helpful against Bertha (sp?) in my most recent run.
The only other Grass type I've used from that list is Leafeon, and that was only because...