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Kartana is potentially soloable in sunny weather.
But it may be tight, you probably need level 40+ counters, the only level 50 in this screenshot is my Mega Charizard Y.
Air Slash / Aerial Ace are a big fuck you to Blaziken, and deals neutral damage to all other worthwhile counters.
But it's 50/50 you're going to get something Charizard and Moltres double-resist.