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Go to minecraft wiki and do a search for "mob grinder" and it gives you a tutorial of how to do it.
You cant find a giant mob in vannilla minecraft but you can sumon him using a command or a spawner.
Mobot
witherboss
You can get a mob spawner in Minecraft by using any pickaxe (except wood) with Silk Touch 1 enchantment or by spawning it in (Dec:52).