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Here is some advice. I have been trying to get a Toxic boost zangoose. Take some pokemon that can learn earthquake. they need 20 or greater speed and 19-28 or so attack. This will kill all the sevipers and leave the zangoose. If your poke isn't fast enough they will attack it and your earthquake will kill it. If your quake isnt powerful enough it wont kill the sevipers and if it is to powerful it will kill the zangoose. I used a toxicroak, Onix, Bunnelby, Manyke, Dwebble in order to get them. I haven't had one with toxic boost yet though. And I use a combee to flush them out with sweet scent. It seems to rain alot on this route though so I have had to stand around alot.