How to raise Environment Level fast

Environment Level climbs fastest by pushing Pokémon comfort from houses (not habitats) up to Tier 4 and by focusing all your effort on one region at a time.

Environment Level tracks how restored a region feels, runs from 1 to a cap of 10, and each of the four story regions needs to hit Level 5 to finish the game's main story. Four things feed it: completing PC Challenges, building habitats to draw Pokémon in, constructing or restoring buildings, and raising the comfort of Pokémon already living there.

Housing beats habitats for raw efficiency — a single Pokémon housed at Tier 4 comfort contributes roughly as much Environment Level as three Pokémon sitting at Tier 2 comfort in habitats. The efficient build order is to drop cheap habitats early just to attract a first wave of Pokémon, then build houses as soon as you can afford them, migrate Pokémon out of habitats and into houses one at a time, and tear down habitats that empty out in favor of more houses or plain greenery.

Comfort itself climbs fastest when you actually check what a Pokémon wants — asking about its comfort level or reading its preference card — rather than feeding it random food or furniture; matching its preferred flavor or item gives a noticeably bigger comfort jump than a mismatched gift. One community-reported shortcut: replacing broken or cracked road tiles costs very little Stone and gives an outsized Environment Level bump with no waiting involved.

Don't split effort across all four regions at once — focus on pushing one to Level 5 before starting the next, since materials and Pokémon-visit time are limited. Following this pattern, most players reach Level 5 across all four story regions somewhere in the 25-35 hour range.

Related: Stone

The Tier-4-house-vs-Tier-2-habitat ratio and the 25-35 hour completion estimate come from a single guide each and haven't been cross-checked against a second source.