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Interesting. I wonder if the bottlecaps are a reference to Pokemon Sun and Moon? Those introduced bottle caps as a rare currency you can use to upgrade your pokemons' stats. Given how many people jokingly (or not-so-jokingly) compare WoW pet battles to Pokemon, I would be surprised not to find any veiled references to the franchise.
The charms you have now wouldn't be a waste... you can still use them to rarify and level the new pets in Legion.