This is also one of the places where Feebas can be found. Both need to be around level 66 (perfect if you want Gyarados in Tier 2). We should also get a Ralts from the Casino and get that leveled up and evolved to Gardevoir as we will need that soon. Once in the area, you have to go through a maze of rocks to get the island, but surf to the top right a bit to find Lost Cave. Note: To fish in Totodile Cave aka Toto cave, you will need level 30 fishing and to fish in Johto safari, you will need level 35 fishing.

try battling trainers while you wait for the E4 to refresh to grind Exp in the most efficient way and if an altar is active while you are waiting/grinding other trainers go and battle these trainers instead. The Water Labyrinth is found north of Island 5 (off Cinnabar Island via Bill). Re-battling trainers give high amounts of Exp so be sure every day to re-battle trainers, these trainers listed below (apart from E4 trainers) give high amounts of exp and have a 24h cooldown so I would suggest waiting for a double Exp altar for them.

Pokemon planet auto fish