You could make it hold an everstone.
Trust me just let it evolve. I have a level.100 pichu and had all the time to evolve it.
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Give them a everstone or press b when they are evolving ;)
It's impossible, the spikey-eared Pichu is always female. The Pikachu-Colored Pichu (The one you got from Game Stop/Wi-Fi) is always male.
The everstone stops evolving all Pokemon that evolve in the first place.
If you stop a Pokemon from evolving, it`ll try to evolve every level after that unless it`s holding an everstone.
Press b. Or give it a everstone.