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Western cave there are several keys.
Keys can be found on the floor in Solar Cave and Western Cave. They are more frequently found in Solar Cave, though.
There is no dungeon called final island, if you mean western cave then the answer would be mewtwo
Bring strong electric and grass Pokemon (to reduce damage received) and after 20F you will find Crevice cave. after 10F in crevice cave there are 4F until you reach scizor and the boss, Frosslass
In the Volcano Cave, after you captured the boss Pokemon Infernape, go to the area where you found the red gem and Heatran appears.however after the game is finished heatran wont appear, sadly
MurkrowButterfreeBeedrillVenonatSnubbullEkansMeowthSmeargleBellossomVenomothExploudPrimeapeIgglybuffTaurosMiltankShiftryKangaskhanEspeonArbokDodrioIvysaurUmbreonBayleefPinsirAggronPersianSwalotHariyamaLickitungGrovyleBlazikenSkarmoryAbsolFeraligatrVenusaurAlakazamTyranitarArcanineTyphlosionSceptileNinetalesSwampertMachampMeganiumSteelixCharizardBlastoiseMewtwo (Boss)
In the west
Western cave there are several keys.
Team Magma boss Maxie in their hideout in the cave by Lilicove's shore
Complete the game, then complete all Cave Levels, and when revisiting a cave, the boss trampoline has a small chance of being shiny. The Pokemon as the boss will hopefully be Reshiram, but other Legendarys are available to.
Mewtwo is level 99 of western cave his friends area is cryptic cave be expecting strong Pokemon in western cave
Mystery dungeon blue:- At the end of western cave. 99f western cave. Must have friend area.
team magma boss Maxie in their hide out along the cave by lilicove's shore
There are loads in western cave.
The Silver Cave is located in Mt. Silver in which you can go after you get all the Johto and Kanto badges. In the Silver Cave you can find lots of strong Pokemon and fight the final boss, Red at the top of the cave.
20F on 20 is Deoxus. You can't go up if you don't beat mirage Deoxus.
Western Cave