Isle Evelup is where you can leave your Pokemon to play on the playgrounds you can built up. Up to 18 Pokemon can be playing at the same time. You can gain experience points to level up, and you can also gain Effort Values (EVs) to any of the six stats.
When you select the Pokemon that will play, you will also be prompted to pick a drink for the Pokemon to have while playing, and how many drinks you will give them (which determines the length of the play session).
Note that the drinks don't cost anything, so give as many drinks as you'd like! Mohn must be rich or something.
|Level Boost Drink||One drink will give 300 exp.|
|HP Boost Drink||Gives +4 HP EV points|
|Attack Boost Drink||Gives +4 Attack EV points|
|Defense Boost Drink||Gives +4 Defense EV points|
|Sp. Attack Boost Drink||Gives +4 Special Attack EV points|
|Sp. Defense Boost Drink||Gives +4 Special Defense EV points|
|Speed Boost Drink||Gives +4 Speed EV points|
* = When Isle Evelup is at max level. Lower levels give less exp and +1 or +2 EV points.
As you can tell, it takes a while to level up Pokemon or EV train them. Assuming max Isle Evelup development and you are trying to max out a stat through EV training, you will need 63 training sessions. Each drink lasts half an hour so that'll run you 31.5 hours of Pokemon playing!
Thankfully, this can be sped up via Poke Beans. Similar to Isle Aplenny and Isle Aphun, Poke Beans will double the speed of training, meaning you can max out a stat in 15.75 hours. This actually isn't all that bad if you are busy and don't have time to play the game yourself.
Here's the (rather steep) requirements to upgrade Isle Evelup:
|Isle Level||Plain Beans||Pokemon in PC|
|1||45 Beans||45 Pokemon|
|2||120 Beans||60 Pokemon|
|3||225 Beans||75 Pokemon|
Higher Level Benefits
As mentioned, the experience points and EVs earned at lower isle levels is much less than at Level 3. In fact, we don't really recommend using Isle Evelup until you've maxed its isle level, since experience and EV growth is super slow until then.