You're talking about Shuckle, which has defenses of 230. That something else is its speed stat, which is 5 (tied with Munchlax for lowest in the game).
kingdra
Kingdra
Pokeradar on route 230
It is at next to Slateport city
At route 230 and 226
Swarm. Route 230 in the grass.
you just have to battle them...
route 223 or route 230
Routes 223 & 230 (Super Rod)
route 230, you will need to use the pokerader.
use the poke-rader on route 230
on route 230 use your pokeradar