Teknoman said:
Is there any reason not to use surf or hydro pump on a water type with decent Sp. Attack? Water Pulse sounds nice, but at the same time, Surf/Hydro is stronger.
1) if you like the confusion bonus that Water Pulse gives;some teams rely on status, although usually you want paralysis as a secondary effect. and if you have some kind of sp. attack boosting hold item or have a sp attack boosting move like Nasty Plot, it can be worth while.
But usually if you're just looking to do damage, you want Surf. Hydro Pump might do more damage than Surf but the accuracy is not as good.
2) if you only have one moveslot left, sometimes you want to choose between Surf or Ice Beam, because even though Surf gets same-type bonus, Ice Beam covers more types.
edit: why would you want to use Solarbeam outside of sunny day? The only feasilbe ways are to use a Groudon or have the monster hold the Power Herb item.
Really, you want other grass moves, like Grass Knot or Energy Ball, that wont cost you a turn and still do good damage.