Notes

Ok Jayden, the first thing you need to do is open minecraft, after you did that, look up the command block mod you want.
I'm assuming you did that by now.
The next thing you do is hold down the left button on the mouse, you will know if you move over a command such this one, ///. And it turns blue. now hold down the CTRL button on your keyboard and press C. Now that you did that. Go to minecraft and get a command block. Open up the command block and click on the bottom line that's flashing, now hold down the CTRL button again and press V. there you go, now use a redstone torch or block and the command should work. although not as good as you'd hope, ok?

/summon WitherBoss ~0 ~1 ~0 {Equipment:[{id:diamond_sword,tag:{Unbreakable:1,ench:[{id:18,lvl:5},{id:20,lvl:2},{id:19,lvl:2},{id:21,lvl:3},{id:16,lvl:5},{id:17,lvl:5},{id:34,lvl:3}]}},{id:diamond_boots,tag:{Unbreakable:1,ench:[{id:3,lvl:4},{id:8,lvl:3},{id:2,lvl:4},{id:1,lvl:4},{id:4,lvl:4},{id:0,lvl:4},{id:7,lvl:3},{id:34,lvl:3}]}},{id:diamond_leggings,tag:{ench:[{id:3,lvl:4},{id:1,lvl:4},{id:4,lvl:4},{id:0,lvl:4},{id:7,lvl:3},{id:34,lvl:3}]}},{id:diamond_chestplate,tag:{Unbreakable:1,ench:[{id:3,lvl:4},{id:1,lvl:4},{id:4,lvl:4},{id:0,lvl:4},{id:7,lvl:3},{id:34,lvl:3}]}},{id:diamond_helmet,tag:{Unbreakable:1,ench:[{id:6,lvl:1},{id:3,lvl:4},{id:1,lvl:4},{id:4,lvl:4},{id:0,lvl:4},{id:5,lvl:3},{id:7,lvl:3},{id:34,lvl:3}]}}],CustomName:Wither Storm,CustomNameVisible:1,Attributes:[{Name:generic.maxHealth,Base:500},{Name:generic.movementSpeed,Base:1.0},{Name:generic.attackDamage,Base:10},{Name:generic.knockbackResistance,Base:500}],ActiveEffects:[{Id:22,Amplifier:1,Duration:999999},{Id:12,Amplifier:1,Duration:999999},{Id:3,Amplifier:1,Duration:999999},{Id:7,Amplifier:1,Duration:999999},{Id:8,Amplifier:1,Duration:999999},{Id:16,Amplifier:1,Duration:999999},{Id:10,Amplifier:1,Duration:999999},{Id:11,Amplifier:1,Duration:999999},{Id:1,Amplifier:1,Duration:999999},{Id:5,Amplifier:1,Duration:999999},{Id:13,Amplifier:1,Duration:999999}],CanPickUpLoot:1}