you can't really catch dialga on ruby, but you can use an action replay to get it because you can pretty much catch any Pokemon with an action replay
In fact, you can.
Dialga Palkia, Rayquaza,Kygore and Groudon
Dialga doesn't exist in ruby. It was created long afterwards.
If you beat Dialga and Dialga faints, you can no longer catch it.
It depends on which game. you can catch dialga on pearl with a code
You can catch it by first turning Dialga's HP into the red. Then use Ultra Balls or Dusk Balls to catch Dialga. It will take time, and you need to use a few balls to catch Dialga.
You can only catch dialga in dimonid
dialga
After you catch Dialga, you do not see the boss again! By Tom Nunn After you catch Dialga, you do not see the boss again! By Tom Nunn
You can catch Dialga in Spear Pillar
You cannot catch palkia in diamond and dialga in pearl but you can catch both of them in Pokemon platinum
in ruby:you catch it in the rusturf cave after beating steven in emerad:same cave but after you beat roxxane in sapphire:same as ruby in diamong:after you beat your mum in a contest in pearl: if you chose turtwig it is all wrong