Cannon - Blastoise (Reason: Because PlasmaCannon wouldn't fit.)
I definitely named my Blastoise this when I was 7. So good choice.
Key (Pronounced Kay) - MewTwo (Reason: MewTwo is my favorite legendary and therefore holds the 'key' to my heart. Sometimes anyway)
I'm not sure why you would pronounce this as "Kay" then...
Jay-Ven - Venusaur (Reason: Well........ For some reason I was thinking of Blue-Jays and Ravens at the time so I combined the two names and came up with this)
This is the most random thing I have ever heard. You were thinking of two types of birds and then came up with a bad mashed name for a big green grass type pokemon (that can't even fly).
Gray Fall - Snorelax (Reason: Well..... Gray is because he was a pain to catch and because I was a little 'gray'/sad about the fact that he kept using rest and Fall is because he kept breaking out of the pokeball and so I felt like Falling off of my bed)
The part that is killing me here is that you were "feeling a little gray/sad." the color that is most frequently used to describe sadness is blue. And yet Blue Fall is just as bad of a nickname.
:nowink:I don't know man...
Blood Wing - Dragonite (Reason: I imagine him with blood red wings and a sort of want for blood shed)
This is the only one I like.