I see… I guess it's time to try max happiness then. Thanks for the help, I'll go try it out right now!
Also, I tried a few things on Eevee in an attempt to make it evolve to Espeon and I found out this, I'll just put it out here in case anyone's curious:
-Eevee evolves into Leafeon with Leaf Stone and into Glaceon with Ice Stone. It can't evolve into Sylveon, but I guess it's because you can catch it in the Bonus Sylveon Chapter.
-Link Stone and Moon Stone do nothing to Eevee.
-After evolving Eevee into Vaporeon, Jolteon or Flareon, it is possible to de-evolve him back to Eevee with a Sun Stone. It's not possible to de-evolve from Leafon or Glaceon (I haven't tried Umbreon/Espeon yet).
-And perhaps the most curious: you can evolve Eevee multiple times in a row. Like, you evolve it into Vaporeon with a Water Stone, then use a Thunderstone on Vaporeon and it evolves into Jolteon, then use a Leaf Stone on Jolteon and it evolves into Leafeon, and so on. However, Glaceon does not share this feature: if you evolve Eevee or one of the evolutions into Glaceon, it won't evolve into any of the others (no stone appears to work on Glaceon).
I think a lot of pokemon locations were changed from the last beta (Jigglypuff is found wild when in the last beta you could find only one, Shuppet doesn't appear in the golden tumbstones in Lavender Tower, Kangaskid was added, etc), but some others remain the same. I guess the locations list could use some updating (I might try to compile a list once I clear the game :) )
PS: Does anyone know at which level does Kangaskid evolve?