Omanyte was the second pokemon ever brought back from extinction.

The shell was found in fossilized solidified lava.
At first it was thought to be a regular fossil until the cut it open.
Due to Omanytes shell being so strong against great pressures of deep ocean swimming, they have a great tolerance to pressure as well as great heat and cold.
A small fragment of DNA had survived in the sealed shell, enough to clone and bring it back.
they artificially inseminated Octillery eggs from a farm in Hoenn who farms them for their ink.

When many were produced they found that they lived in large groups and had amazing buoyancy design within their shell to help them control going up and down in the water. they also could store a huge amount of pressure, essential for water based attacks.

When they were put on the market many people bought them despite their incredible price, however not many people used them for battle, and many were put in large tanks for display, mainly owned by rich business men.

when threatened they lift their tenticles as an attempt to make themselves look bigger.

Hope you like it