Two levers, not one

Most Trainers focus on attracting new Pokémon to raise their Environment Level. That works early. But past Level 4 or 5, new arrivals alone stop moving the needle.

Environment Level is the sum of every Pokémon's Comfort Level in that area. To raise it, you have two levers: bring in more Pokémon, or improve the comfort of the ones already there. Both matter equally once you hit the mid-game.

What Comfort Level actually measures

Each Pokémon has a Comfort Level ranging from "iffy" all the way up to "awesome." Five factors determine it: habitat size, required items, furniture preferences, roommate compatibility, and bonus items like windows or plants.

Meeting the bare minimum to attract a Pokémon lands their comfort at around 40%. Getting them to "awesome" means satisfying all five factors.

A Pokémon sitting in a bare-minimum habitat drags your Environment Level down. One with a fully decorated home pulls it up.

Finding the underperformers

Open Pokopia Companion and go to My Areas. Tap the area you want to improve. Look at the Pokémon currently living there and find the ones with the lowest comfort scores.

Pick the two or three at the bottom. Open each one in the Pokédex and check their full habitat requirements. Compare what they have to what they actually need.

Three fixes that move the number

Habitat size. If a Pokémon needs a 5x5 room and got a 4x4, a smaller room caps their comfort. Expanding is often the single biggest gain you can make.

Bonus items. Most Pokémon have a short list of extras that are not required to attract them but add comfort points. A window, a plant, a toy. These are cheap to craft and easy to miss.

Roommate mismatch. Two Pokémon sharing a house with no overlapping preferences reduce each other's comfort. Open the Roommates section in the app. Swapping one roommate for a better match can lift two Pokémon's scores at the same time.

Wait before you check again

Environment Level does not update the moment you make a change. The game recalculates periodically. Leave the area, explore somewhere else, then come back. Your level will have caught up.

If you are stuck at a specific threshold, look at both your total Pokémon count and your average comfort score. You probably need a few new residents and a comfort pass on the ones already there.