giove97 Hellooo, here is a team with what you asked for! We actually built around the same idea you requested for SCL, and my teammate Elfuseon used this in his game and won! Here's the team :
https://pokepast.es/f0d6d5142ba3de36
The Mudbray being Choice Scarf makes it a strong offensive core paired with Diglett-A. Coupled with Koffing to deny Regenerator, they become very threatening since they wear down the Pokemon that can take their attacks. Mienfoo has more SpD to take special attacks a little better. Koffing is Tera Water to stop Shellder. Hope you like it!
I know it's a little lame to share a pre-built team for Secret Santa, but the next DLC drops kind of very soon, and your request might become obsolete, so I wanted to send it out asap so you can try it out before. Also I really like this team, and it fit your request perfectly so...
However, feel free to DM me a new request anytime after DLC drops, and I'll be able to make that your real Secret Santa team for the holidays if you want! Cheers :)