Route 18

Underwater Trench. 7 species live here; the commonest is Arrokuda, at 20.6% of encounters.

What is in the grass

Encounters are weighted by catch rate and by how strong a species is next to the rest of the route, commonest first. The catch odds are the game’s own — worked out with the same code that runs when a ball is actually thrown, against a full-health Pokémon at Lv.27.

Pokémon	Type	Chance	Levels	Catch rate	Poké Ball	Great Ball	Ultra Ball	HP
Arrokuda	water	20.6%	25–28	255	43.9%	59.5%	73.8%	63
Dewpider	water bug	18.7%	25–28	190	35.2%	47.7%	59.2%	61
Gulpin	poison	17.4%	25–28	190	35.2%	47.7%	59.2%	78
Seel	water	16.6%	25–28	190	35.2%	47.7%	59.2%	76
Frillish	water ghost	16.2%	25–28	190	35.2%	47.7%	59.2%	70
Spinda	normal	6.9%	25–28	60	14.8%	20.1%	24.9%	73
Mantine	water flying	3.5%	25–28	25	7.7%	10.4%	12.9%	86

Nearby