/summon zombie ~ ~1 ~ {CustomName:"Zombie Boss",CustomNameVisible:1,ArmorItems:[{id:"minecraft:diamond_boots",Count:1b,tag:{Unbreakable:1,ench:[{id:0,lvl:4},{id:1,lvl:4},{id:8,lvl:16},{id:3,lvl:4},{id:4,lvl:4},{id:8,lvl:12},{id:9,lvl:12}]}},{id:"minecraft:diamond_leggings",Count:1b,tag:{Unbreakable:1,ench:[{id:0,lvl:4},{id:1,lvl:4},{id:3,lvl:4},{id:4,lvl:3},{id:7,lvl:2}]}},{id:"minecraft:diamond_chestplate",Count:1b,tag:{Unbreakable:1,ench:[{id:0,lvl:4},{id:1,lvl:4},{id:3,lvl:4},{id:4,lvl:4},{id:7,lvl:2}]}},{id:"minecraft:diamond_helmet",Count:1b,tag:{Unbreakable:1,ench:[{id:0,lvl:4},{id:1,lvl:4},{id:3,lvl:4},{id:4,lvl:5},{id:5,lvl:4},{id:7,lvl:4}]}}],HandItems:[{id:"minecraft:diamond_sword",Count:1b,tag:{AttributeModifiers:[{AttributeName:"generic.maxHealth",Name:"generic.maxHealth",Amount:2,Operation:0,UUIDLeast:33451,UUIDMost:700605,Slot:"mainhand"},{AttributeName:"generic.knockbackResistance",Name:"generic.knockbackResistance",Amount:0.45,Operation:0,UUIDLeast:588828,UUIDMost:129927,Slot:"mainhand"},{AttributeName:"generic.movementSpeed",Name:"generic.movementSpeed",Amount:0.2,Operation:0,UUIDLeast:974915,UUIDMost:446650,Slot:"mainhand"}],display:{Name:"Zombie's ultamate sword",Lore:["A great might sword eard By Killing The Boss"]},ench:[{id:34,lvl:4},{id:16,lvl:2},{id:19,lvl:5},{id:20,lvl:3},{id:51,lvl:1}]}}, {id:"minecraft:shield",Count:1b,tag:{Unbreakable:1,BlockEntityTag:{Base:15,Patterns:[{Pattern:bts,Color:3},{Pattern:tts,Color:9},{Pattern:bo,Color:5},{Pattern:mr,Color:12}]}}}],ArmorDropChances:[10.10F,10.0F,10.0F,10.0F],HandDropChances:[55.0F,0.0F],Attributes:[{Name:generic.maxHealth,Base:115},{Name:generic.movementSpeed,Base:0.
2},{Name:generic.attackDamage,Base:6},{Name:generic.followRange,Base:100},{Name:generic.knockbackResistance,Base:0.25},{Name:generic.armor,Base:10}],Health:129.0f,PersistenceRequired:1}




(good luck)
...
https://www.youtube.com/watch?v=ttCReZEfpYA