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Top is my actual team at the moment, bottom is projected team members. Not sure at all for my final three slots. Maybe trade over a Charmander along with Chansey from Yellow. If I had Gold on my spare 3DS, I'd consider using Steelix. Donphan is likely with that not the case. If Jumpluff doesn't pan out I might bring Chikorita back in and definitely pack Charmander then.
Also Silver Corsola is the cutest sprite ever oh my gosh. Might try to finally get that Shiny Corsola I've wanted for forever, since I know how to abuse Red Gyarados in RBY.