There is no specific ball needed to catch Rotom, use whichever ball you want.
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you don't need either but its easier to have rotom so you can get the rotom forms faster.
No. You can only catch Rotom once.
First you need to catch a shiny scrotum then level it up to level 50 and it evolves into a shiny rotom.
a dusk ball when he is on yellow but use a 23 and under Pokemon and you can find the dusk ball at the inside of the Pokemon legue at the right counter
To get Rotom you need the National Dex and it has to be night (after 8pm). Then go back to the TV and try again. It's at level 15 and hard to catch.