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A grass/fire chili pepper is probably the 2nd most creatively bankrupt idea I've seen for a Pokemon. Only behind a normal/ghost schrodinger's cat.
Even if they do use the pepper or schrodinger's cat concept, they'll probably not do it the way everyone expects. Like a mono-grass pepper with a signature move or ability that causes burning. Or a cat that can randomly be either mono-normal or mono-ghost when sent out.