If you guys really feel extremely bad about it, why don't you catch and train a Gliscor in the games? In memory of the character.
They are very good Pokémon.
I did it during Ambipom's tenure and that hasn't dissapointed me.
*Goes of to breed a good Gligar*
Funny you should say all that. I recall, back when Ash got Gligar and the time of his evolution, being compelled to breed and train my own in-game Gliscor for the novelty of it. Ended up being a very likable Pokemon.
As for releases... Can't say I don't get a twinge of anger any time a Pokemon gets released. I say it's because of my 'Collect-aholic' nature. Just imagining Ash or any of the Main Characters with a huge repitore of Pokemon to call upon makes me giddy inside. I consider any 'mon the Stamp Marker of a job well done, an Ode to Training Skills, to see your kickass Pokie mop the floor with Nameless Trainner #84.