The starter choice locks in your early-game elemental identity. Leafbu starts in Verdant Valley with the smoothest Grass matchups - everything in the first zone is weak to Leaf. Blazpu starts in the volcanic intro with Fire advantage against Bug and Ice types, but the very first World Boss has a Fire resistance that makes the early fight rough.
Bubble is widely considered the optimal starter because Water has a direct elemental advantage against the first major World Boss encounter. That single matchup gives Bubble players a 2x damage window during a fight where every other starter is stuck at neutral.
By mid-game the starters blend together - all three have viable Level 90 evolution paths. The difference is the first 30 levels, where the wrong starter can cost you two to three extra hours of grind to compensate for bad type matchups.
If you care about the Arcapex raid meta specifically, the Blazpu → Lavite → Lavarock line scales hardest into the Fire-heavy boss rotation. If you want the most flexible account overall, Bubble → Void Strombones is the safe mid-game pivot.
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