User blog comment:ArbitraryNumbers/Pokemon Wack Notable Pokedex Entries/@comment-31165326-20191215052757/@comment-27799548-20191215071255

There are actually several dex entries in the series that actually do mention indian elephants. I believe Gastly and Raichu were both stated to be capable of taking down indian elephants specifically, so I think the developer was likely playing off of that and made it into a running gag, lol

Unfortunately very few of these indian elephant feats happen outside of Gen 1, which really sucks. Most of the official mons don't even have altered dex entries at all