Otherwise it will make....no sense. Beware though, for younger users, the swears are bleeped out in this show, but they're still, you know, THERE. ^^ So maybe not for you kiddo kiddos.
This is one of my favourite running gags from 'Pokémon Talk', among other classics like:
"What the f*ck appened to the floor?!" - Squirtle
"Hey everyone! It's a pleasure to be here on your show today." - Jolteon
Also the 'Arceus' and 'Yveltal' thing on Mikey's channel (aka MandJTV) in general, that too.
The ONLY correct pronounciations being 'Arcoos' and 'Yahvaltal', obviously.
(Awesome drawing; you captured Umbreon's crazyness perfectly.)
Oh man, I almost forgot that series existed when I was first introduced to that running joke. I ended up hearing it for the first time on the Christmas special and ended up watching it all again from the beginning partially because of the random inclusion of this joke. There are not many episodes, but it is fun to watch.