If you want to enchant an item with very high enchantments that are not supposed to be allowed, like sharpness 6, you'd need to use /give. For example, for a sword with sharpness 12 and knockback 5, you'd need to use: /give @p diamond_sword{Enchantments:[{id:sharpness,lvl:12},{id:knockback,lvl:5}]}.

You can enchant just about everything, so if you want a stick that has a very high knockback, you can simply use: /give @p stick{Enchantments:[{id:knockback,lvl:30}]}

You can replace these enchantments with any enchantments, for example, you can use: /give @p diamond_sword{Enchantments:[{id:smite,lvl:65},{id:looting,lvl:10000},{id:fire_aspect,lvl:12}]}

/give @p stick{Enchantments:[{id:sharpness,lvl:130}]}

If you want to get an enchanted pickaxe, you can use: /give @p diamond_pickaxe{Enchantments:[{id:fortune,lvl:1000},{id:efficiency,lvl:10000}]}

You can do this with any enchantments you want, and almost any object you want.

If you want to enchant an item with very high enchantments that are not supposed to be allowed, like sharpness 6, you'd need to use /give. For example, for a sword with sharpness 12 and knockback 5, you'd need to use:

/give @p diamond_sword{Enchantments:[{id:sharpness,lvl:12},{id:knockback,lvl:5}]}. 

You can enchant just about everything, so if you want a stick that has a very high knockback, you can simply use:

/give @p stick{Enchantments:[{id:knockback,lvl:30}]}

You can replace these enchantments with any enchantments, for example, you can use:

/give @p diamond_sword{Enchantments:[{id:smite,lvl:65},{id:looting,lvl:10000},{id:fire_aspect,lvl:12}]}

or:

/give @p stick{Enchantments:[{id:sharpness,lvl:130}]}

If you want to get an enchanted pickaxe, you can use:

/give @p diamond_pickaxe{Enchantments:[{id:fortune,lvl:1000},{id:efficiency,lvl:10000}]}

You can do this with any enchantments you want, and almost any object you want.