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I not sure if the server lag is still an issue or not, but i just had an idea that might help. instead of having one large server serving 10k+ players, what about a hand full of smaller servers dedicated to a popular metagame + some smaller ones?
Looking for flawless Brave Timburr with Iron Fist and Drain Punch, can offer flawless Timid Magic Guard Abra, Flawless Timid Ghastly, Flawless Bold Gooey Goomy, Flawless Adamant Gale Wing Fletching.