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I did everyone in this thread a massive favor and leveled mine to 75 in hopes of getting Earth Power but no dice. The last move it learned was Electrify at 45. I gave up.
I took it to the move relearner as a Heliolisk and it can be taught Thunder and the rest of its Helioptile movepool, so I don't think it behaves the same way old stone evolvers did.
Just evolve it once you get Volt Switch at level 40.