Soon, I am going to catch a Lugia (my favourite Pokemon!) I have already decided to teach it Punishment, Hydro Pump, and Aeroblast, but I can't decide if I want to teach it Thunder or Dragon Rush. Can you please tell me what you think I should teach it? From your pal, Dominic.
Out of the two, Thunder would be best. Although it is less accurate normally, it will be more useful for defeating Flying and Water types.