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Your summary screen crash and mega evolution issues are extremely hard to fix as those areas aren't well understood by many on this site, particularly the summary screen. As JustIChris said, you probably overwrote some important stuff in the ROM, but fixing such a nebulous thing isn't really feasible as nobody here really knows what's been deleted or how everything fits together in the ROM.
The Sandslash error could be easily fixed by repointing and reinserting the sprite, but there's not much reason to do that it if you can't fix the other two issues. I'd suggest writing off that ROM as broken and going to an earlier back up where those errors aren't present.
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