So today my Grotle evolved...

[Mr. Brightside]

and then i looked at Torterra's entry on pokedex to find out that Pokemon live on its back! And some of them spend their whole lives there! What the...? What kind of Pokemon are those anyway?

[DivineAll]

I'm guessing the kinds that will show up in Generation 5?

[Austrian ViceMaster Alex]

Well, those have to be very small Pokémon. Maybe some bug type Pokémon that enjoys living in that tiny tree on Torterra's back.

And which Pokémon would actually lay an egg on the back of a Torterra in the first place? Oh, I forgot, eggs just magically appear out of thin air ...

[Mr. Brightside]

@Austrian ViceMaster Alex: That's exactly what i thought, but even so, it is very weird. Especially since pokedex says that some of those Pokemon spend their whole lives on its back! So when you have a Torterra you have other Pokemon as well? Is it like a smaller Pokeverse? What the heck do they it?!

It is VERY weird @.@ Hopefully we'll find out with the fifth gen.

[Magmar]

It may be similar to the Mantine that hides the Remoraid beneath its scaly flesh.

Or perhaps akin to Slowpoke, which allegedly needs a Shellder to become a Slowbro.