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I had to plough through 8 gyms to unlock Mt Silver with only four level 50 bug Pokemon. Heracross swept through them all but needed help with Blue, only so I could catch a female Larvitar with the two Friend Balls I had available.
I have one now, and I'm planning to breed DD onto it with Axew, but all my Axew and family are female.
It's been seven hours now with a few brakes in-between.