Question

What moves does metronome boost the power of?

Answer 1

Metronome- Boosts power of moves used repeatedly. Each time a move is used consecutively, its power is boosted by 20% up to a maximum increase of 100%. Switching or using another move returns the move's power to normal.
Multi-strike moves are counted by the number of turns on which they are used, not the number of hits made

It boosts the power of any move you use consecutively.

Source

Answer 2

>Boosts power of moves used repeatedly. Each time a move is used consecutively, its power is boosted by 20% (10% in Generation IV) up to a maximum increase of 100%. Switching or using another move returns the move's power to normal.

It boosts the power of all moves that you use consecutively. If you switch out the boosts will reset.

Source
Hope I helped.