As a matter a fact I do spare the odd second to create such useful nicknames for my battle creatures. That is precisely why you will notice my Weezing shall respond to the name 'Fart'.
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Let me explain.
Ladies and gentlemen, let me remind you that Weezing has but two openings which simultaneously serve for both intake and exhale. Also, notice how sometimes the gas released is brown. From these two facts, any T-Rex with so much half a cracked peanut for a brain can conclude that my nickname is fitting indeed. Myesh, it is, myesh.
And for all of you who always wondered why Ash & Co. start choking when it uses it's 'smug' attack, bless you, you now know~