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Beat all of the trainers on the route right of Pewter City. Butterfree leveled up to 20 afterwards. Then I went into Mt.Moon. After walking forever, finally found, battled, and caught a Paras. Trained it to level 18 on Clefairy's and Geodude's. Beat Team Rocket's neowth, koffing, and Ekans. Off to Cerulean! My Paras was on level 22 when it battled Gary, Butterfree on 25. (Battled Misty and lost on purpose a lot, havent beaten her yet) Went up the bridge, level my pokemon some more, helped Bill, went back to fight Misty, and won. My Butterfree is now level 28, and my Paras evolved into Parasect on 26. It is now on level 28.