You have to beat the game, which means going to Sky Tower and defeating Rayquaza. You should automatically get Solar Cave after that.
In solar cave
You can find them lying around in Solar Cave.
entei
In solar cave you get there after you beat rayquaza
you cant
kasi kailangan mong magpakabolang
You can find one in Solar Cave.
solar cave and buried relic
solar cave
I believe it is in Solar Cave...
there are 20 floors there are 20 floors
you usually can find keys in the solar cave