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After beating the Pokemon League, you still can't go to the Cerulean Cave. To be able to enter you have to get the National Dex by catching 60 different types of Pokemon and showing your PokeDex to Professor Oak, also you have to do the Ruby Sapphire side quest in the Sevii Islands. By then you will be able to enter the Cerulean Cave that contains Pokemon levels 50-60 and Mewtwo Level 70 at the Bottom floor of the Dungeon.
Maybe this videos will help:
http://www.YouTube.com/watch?v=2vOwD9JCnZg&feature=related
http://www.youtube.com/watch?v=c4guYVGMwgY&feature=related
http://www.youtube.com/watch?v=rIIfmODFQJo&feature=related
http://www.youtube.com/watch?v=YEjwjFv3ovA&feature=related
http://www.youtube.com/watch?v=lNMu4nwDVig&feature=related
http://www.youtube.com/watch?v=Q5ddprvQo5g&feature=related
http://www.youtube.com/watch?v=lZfl0XSzm9s&feature=related
http://www.youtube.com/watch?v=XOn1NHpxUIA&feature=related
These videos are the videos that show you how to get Mewtwo since you have the NationalDex And have beaten the elite 4 once.
What else can I help you with?
Where can you find alakzam in Pokemon LeafGreen?
Cerulean cave
Pokemon LeafGreen where is 2end ruby?
lost cave
Is there a way to get Mewtwo in Pokemon LeafGreen?
Yes it is in a cave.
In Pokemon LeafGreen where do you get the HM Waterfall?
In icefall cave.
Where to get mewtow Pokemon LeafGreen?
in cerulein cave very back
Where is cerulien cave in Pokemon LeafGreen?
You can find the Cerulean Cave in the northwest corner of Cerulean City in Kanto in Pokemon LeafGreen. The cave contains the Pokemon Mewtwo.
What happens in awakening cave in Pokemon LeafGreen?
There is no awakening cave.
How to get Pokemon LeafGreen Ditto?
in cerulean cave.
Where do you get dugdrio in Pokemon LeafGreen?
Diglett cave
In Pokemon LeafGreen what is in lost cave?
How to get to lost cave in leaf green??
How do you get into Altering cave in Pokemon LeafGreen?
Altering cave is on 5 or 6 island.
How do you get by the cave in Pokemon leafygreen?
that would depend on which cave, for there are many caves in leafgreen.
Where do you find the three dogs in cerulean cave in Pokemon LeafGreen?
There not in cerulean cave.
Mewto in Pokemon LeafGreen?
back of cerulean cave
Where is icefall cave in Pokemon LeafGreen?
on four island
Where is icefall cave on Pokemon LeafGreen?
its on 4 iland
Pokemon LeafGreen where is 2end ruby?
lost cave
