Abilities, how will they work?
Answer is simple, noone knows if they will even add Abilities.
Slaking is going to be a special Pokémon in Pokémon GO, that is because of the Move “Yawn” Which has a DPS of 0, which means it dosen’t damage the opponements. So the only way for Slaking to deal damage will be by using the “Charge Move”.
Slaking Raid Boss (If it happens)
Slaking as a Raid Boss will be VERY special, because of “Yawn”.