I see.I'll look for that crabawler by myself.if I find another one,I'll post here.I didn't edit my crabawler I got it when I was playing US and thought anybody should see this error.If the encounter table says that it's impossible to get it., it could happen an error in my game.so I apologize for this.
Another error I found is about this raticate that shouldn't be not legal in gen 1 sav files. it is found in pokemon blue in route 4.I looked for it in serebii.net and dind't found this encounter but I could take three of this pokemon.
020 - RATICATE - 1196.pk1