After a lot of attempts, finally I made it.
Grinding and Cane of Byrna is allowed because things getting too difficult for me after Sombla lol.

Well, it will be more easier if earthpony spams Cane of Byrna's CA.
But somehow I decided to use it only for too difficult (or just bothering) parts.



Timestamps
0:01:31 Everfree Forest
0:04:30 Froggy Bottom Bogg
0:07:42 Cloudsdale
0:11:44 Ghastly Gauge
0:17:38 Appaloosan Mines
0:23:03 Manehattan

0:29:14 Enter the Canterlot Castle
0:30:59 Cerberus
0:36:26 Siren Gem
0:47:50 Tatzlwurm
0:50:52 The Creature
0:53:58 start grinding
1:01:39 King Sombla
1:06:36 Nightmare Moon
1:13:32 Trixie
1:19:55 Dullahan
1:21:40 Chrysalis

1:25:04 Realm of Chaos
1:29:08 Discord