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i killed him as an level 70 MUDKIP!! and level 69 cyndaquil ^^ and indeed, use LOTSA reviver seeds and other things. check out on the internet for mystery gift codes for golden seeds. those increase your lvl with 5.
I beat him with a level 39 Chimchar and Turtwig. Just use Protect if you want to. Also seeds like Totter and Sleep come in handy. Revevier seeds also are delightful to have. If possible, find an Ice Beam TM and give it to your Squirtle. Just a suggestion !