Lixonuke + Lilac, Maplepot and Yggdrassil

Lixonuke (Porygon+Computer Virus): This was the Pokemon responsible for the release of all the genetically created Pokemon. It was created at the last minute by Hogan so that it would hack the system and destroy the machines. But after wards, Lixonuke has taken a real shape and it oftens hacks other computers where it feeds on the Database.
 
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Lilac (Bellsprout+Sandshrew): A flower pokemon that seeks shelter in pots. It moves around by hoping, searching for a prime position in the sun.
 
Maplepot (Weepinbell+Sandslash): It grows a lot during its evolutionary stage and the pot it was using early has broken. However it is emprisoned in it and cannot switch. Its leaves have an oil covering them which gives a rash on contact.
 
Yggdrassil (Victreebel+Wailord): It's the tallest grass Pokemon to have ever walked the Earth, growing taller than the tallest trees. It is said one footstep drains the ground below of its water, and that its roars pushes the clouds away.
Yggdrassil are too big to be caught in the wild and must be raised from a previous evolved form.