It doesn't raise the water level. It lowers it. Whoever told you that it raises the water level lied to you.
you play more games and you raise your medal level
You just have to raise your heroe's level
You need to raise its friendship not raise its level.
you can't raise them to level 999 because the maximum is level 100 and anyway if a Pokemon could reach to level 999 I'm not saying they can, it will take a long time to raise them
yes. anything relating to "combat" will raise your combat level.
No. Only combat skills will raise your combat level. Just remember that prayer and summoning will raise your combat if your level them up. All other skills will not.
raise your hero level
how do I raise heart level of my cat
Any dam will raise the water level behind it.
Raise Ralts up to level 20 then raise Kirlia up to level 30
Raise it to Level 20 and it will evolve into Loudred. Then raise it to Level 40 and it will evolve into Exploud.
The following skills can raise your combat level: Attack Strength Defence Magic Ranged Prayer Summoning Hitpoints. All other skills do not raise your combat level.