I am not exactly sure but my guess's on this list: Kyogre+ Lapras+ Zigzagoon? Hoppip? Tentacool+ Milotic+ Relicath+ Pelipper?
+more sure of answer, seems logical ?less sure of answer Try a Lanturn, its water and can learn flash because of it's electrical properties
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Any Pokemon that can learn a electric move
a latios can learn cut, fly, waterfall and flash. while wiscash can learn rocksmash,surf, dive and strength ... datz a good answer but you wudnt want 2 teach a latios any HM's. i suggest u catch a sharpedo, it can learn strength, dive, surf, waterfall and rock smash.. but you could only teach 4 of the 5 HM's to a pokemon Also marill and Azumarill can learn four Hm move: rock smash, waterfall, dive and surf tropius can learn fly, cut, strength, rock smash and flash
Flash and cut can both be found on tms so I would just use the tm on any pokemon you can
I think that picachu can learn it. Any electric types I believe.
Almost any electricity or fire pokemon, otherwise pretty much only the occasional weaker pokemon. I believe Ratata MIGHT be able to. If you are looking for it for Rock Tunnel there is a guide on IGN.com for how to get through without Flash.