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After the siege you can come back to the place Emily was locked in and you get the TM for Self-Destruct, normally this would be interesting, but thanks to 6-0 autism this thing is practically useless.
After the siege the last of the boss' Pokemon becomes available in a certain skyscraper, RG already showed the rewards yesterday, but it's basically a choice between some good Fairy types or telling the boss you hate eggs and Fairies and I think now he just gives you EXP candies or money, don't rightly recall, I don't think he gives you leftovers anymore.