If I use Radiant Alakazam's "Painful Spoons" Ability to move two damage counters from one of my opponent's Pokemon to a Fusion Strike Pokemon with Fusion Strike Energy attached to it, what happens to the damage counters?

Since the opponent's Fusion Strike Energy prevents all effects of Abilities done by your Pokemon, if you choose to move the damage counters to a Fusion Strike Pokemon with Fusion Strike Energy attached the damage counters would be discarded rather than moved onto that Pokemon. However, if you choose a Fusion Strike Pokemon with Fusion Strike Energy attached as the source of where the damage counters would be moved from, they simply are not moved and the Painful Spoons ability stops there.

Relevant cards

SWSH12_59

SWSH8_244