On firered, you need to beat every trainer in the game and have rock smash and strengh
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Mewtwos code: 94000130 fffb0000 d5000000 00000096 b21c4d28 00000000 b0000004 00000000 c0000000 0000000b d7000000 00024620 dc000000 00000006 d2000000 00000000
there is no cave
Depends on which cave you're talking about:victory road,wellspring cave,chargestone cave,giant chasm,all those,relic ca...no that's not a cave.
go to cerulian city and talk to a kid that's be hind the house where a man will ask you if you collect badges and when you talk to that kid his itemfinder will go off then go up to the bridge and surf down the water to where mewtwos cave was and when you see the kid again surf up next to him and turn to the west and go to the wall there should be one spot to your left and right filled with water then lookto your left and hit the "a" button and you will get the berserk gene
Cliff Cave is near Cianwood City. Just go in the cave you see and you'll be in Cliff Cave. When you pass through Route 47, and see many Cave entrances, that will also be considered Cliff Cave.