Don't waste your TMs.
Jolteon is N times easier to get than Ampharos, and is a much better electric attacker. It even has all STAB movesets unlike Ampharos.
Charizard vs Flareon is different, Charizard has the same best moveset as Flareon (FS/OH) and additional (double) resistances that Flareon doesn't have. But both Ampharos and Jolteon have single electric typing, but Ampharos has worse movesets.