I am asking two questions in one. So here is the first one:
How much happiness does Eevee have to have in order to evolve into Umbreon?
If my Eevee evolved into Umbreon, would Return's attack power be 110?
I got the number 110 from here: http://pokemondb.net/move/return
I also gave my Eevee the Soothe Bell if that helps.
Like all pokemon who evolve by happiness it evolves with happiness at 220
No, it would be 110 if its happiness was maxed. At 220 the base power would be around 95-105 since the equation is : base power =happiness÷2.5