I've crashed 7 times in the ashen forest. 5 times in the grass trying for encounters and 2 times against the first magma grunt. 3 of 5 encounter crashes were upon encounter before battle ever starts, the other two were upon executing super effective hit via Aqua Tail on Vulpix. Against the grunt it's the same, Aqua Tail on Numel caused crash the first time, Aqua Jet the second time.