i doubt the hydroblue thing and thunder yellow. first of all, it would be electric yellow, and ocean/sea/aqua blue. not hydro. hydro is a latin(i believe) prefix for water, nintendo wouldn't do that.
yes you can get a surfing pikachu in this game... long process though.
1. Get pokemon box, and ruby/sapphire
2. Fill your boxes with 999 total pokemon(one less than maximum)
3. The last position will be filled with a pichu that know surf.
4. You transfer it to your fr/lg/e/r/s and evolve it to a pikachu.
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