Undersea Tunnel is a cave located in the middle of Route 508. Near the end, you encounter your rival and Mosmero and battle them in a double battle. For winning, Mosmero gives you the Vs. Seeker.

Pokémon Level Location Rate
Buizel 17-20 Cave 39%
Rynos 17-20 Cave 25%
Kawappa 17-19 Cave 25%
Rollder 17-18 Cave 10%
Diglett 19 Cave 1%

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