Ruling A heavy question

[Kimori]

OK, here's the situation:
I have Masquerain (MT) in play as active and attack the opponent
The unfornate one has mantine in play with its baby effect, which lets the retreat cost of his Pokémon -2
- Will that reduce the damage of Masquerain's 1st attack, which damages 20 for each retreat cost of the defending Pokémon?

 

[Papi/Manny]

It would

 

[Lt. Empoleon]

Yes it would because it says the retreat of the pokemon is [c][c] less. So lets say the retreat is [c][c][c], adding Mantine's effect making it [c].