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I don't use a set Pokemon for catching another Pokemon. I just usually use the best Pokemon in terms of strength and type effectiveness. One Pokemon I admire and that would be very good for catching most Pokemon would be Kricketune. See for yourself.
Kricketune.
Sing False Swipe Bug Buzz X-Scissor
Moves in italics would be the good moves for catching a Pokemon while the moves in bold are STAB.
I think Kricketune is a very good Pokemon but it's a pity it's total base stat is only 384.