It is potentially dangerous to catch missingno. Because it is a glitch in the game, it can result in erasing all your data in your game.
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you cant catch missingno but you can send it from red and blue I'm pretty sure but it wil turn into a ditto i think you can also catch glitches on Pokemon crystal.
If you catch missingno from the Cinnabar Csland glitch, nothing will happen, except, when you level it up, it evolves into Kangaskahn (teach it fly beforehand for some lols :D) But if you catch missingno from the lavender town glitch it will screw everything up, so don't!!
You get out of there quickly don't try and catch it
No because the man who teaches you how to catch Pokemon will not show you how to catch Pokemon no matter how many times you talk to him plus if he does show you how to catch Pokemon and you go to cinnibar island and try to find missingno it still will not show up ever.
You can however, before you try to catch it, tou need to know two things: 1. It can break out of a master ball (remember, it's a glitch). 2.Catching Missingno will easily corrupt your file