It depends if you're in a cave, or just on land. If you're in a cave, then use Dusk Balls. It you are on land use ultra, great, or poke balls. Also the second selection of balls also depends on level. Hope this helped!
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Yes, and here's how: get a Wobbefet or Dugtrio from either LeafGreen or FireRed. Then, find Mesprit using the poketch app. Have Wobbefet or Dugtrio first in your party, and battle it until it gets to red hp, and if possible, paralyze it. Keep throwing ultra balls at it, and eventually you will catch it. Here's why it works. Dugtrio and Wobbefet both have abilities which don't allow Mesprit to flee. You can also have a Golbat/Crobat and use mean look, but the method above works best. Note: this method can also be used for catching Cressilia.
If your looking for a dugtrio in FireRed it is actually quiet simple. First you go to vermillion city and keep going right, until you find a cave. while you are in that cave you will encounter a lot of diglets. But if your lucky you will find a dugtrio. If I found dugtrio and so can you. If you want to catch it you must first bring it down to low health befor catching it. or you get a repel from the mart use that in the cave and then a dugtio will show up
26 ultra balls and about 10 dusk balls with lvl 65+ pokemon
use poke balls on it
the best way to catch a registeel would be to use fire types then use lots of dusk balls asuming its in a cave and bring lots of spare timer balls if it takes too long.