Underground crystals are bigger where as crystals formed on the surface are smaller.
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sonic is older than manic in sonic underground
Sonic Underground is an animated TV series. And no, you cannot unlock episodes, or characters other than Sonic, from Sonic Underground in Super Smash Bros Brawl.
Some people still see Sonic underground and some don't, but Sonic x is a brand new series that has better drawn skill of Sonic and his friends. Plus some new ones like Shadow The Hedgehog which is my all time favorite Sonic character.
You are most likely in a Mega Taiga biome. It consists of a lot of mossy cobblestone boulders. If you are underground, than you have found a dungeon and can now farm mobs for a lot of exp.
Pokemon can look different and have different sizes. Since there are more than 500 Pokemon, you should be more specific.