I think that even in Ubers, this would make Excadrill a bit broken as a free Swords Dance while dealing a ton of damage for a mon that's already one of the best Dynamaxers in the tier (already being A Rank on the VR) already puts it over the edge but then having it set hazards on top of that adds insult to injury, since it removes counterplay in Focus Sashes. I'd suggest removing the Attack boosting effect and nerfing how many hazards it sets at one time in some way.
All of these are fine and I do like that you did 1 sub from every gen that was allowed but this slate still adheres to the rule of 4 subs per slate so I do still have to ask that you remove 2 of these and use them for a later slate
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My subs
Pokemon: Primarina
Type of the Gigantamax Form: Water/Fairy
G-Max Move Name: G-Max Operetta
G-Max Move Type: Fairy
G-Max Move Description: Hard coded to 160 BP and is a Sound move
Competitive Overview: This move gives Primarina a nuclear powered secondary STAB to smack the numerous Dragons of Ubers with while going through Substitutes, one of the best ways to stall out Dynamax. Furthermore, Primarina can either use Torrent to have a great dual STAB combo in Dynamax with Max Geyser and Operetta or it can use Liquid Voice to have a nuclear powered Water STAB, which very few of the best Pokemon in Ubers want to take, that still allows Primarina to set rain with Max Geyser and make it even stronger.
Pokemon: Tangrowth
Type of the Gigantamax Form: Grass
G-Max Move Name: G-Max Entanglement
G-Max Move Type: Grass
G-Max Move Description: Sets Leech Seed and the effects of Wrap on the opponent
Competitive Overview: As a defensive Dynamaxer, Tangrowth as it is is likely outclassed by Ferrothorn thanks to Ferro's dual STAB and overall higher bulk. However, with G-Max Entanglement, Tangrowth can be a much more annoying defensive Dynamaxer, slowly draining the life out of offensive threats while being extremely bulky in its own right, with the opponent taking 24.5% if they are not a Grass-type and trapping them, allowing Tangrowth to beat many offensive threats 1v1 in a pinch.
Pokemon: Malamar
Type of the Gigantamax Form: Dark/Psychic
G-Max Move Name: G-Max Inkantation
G-Max Move Type: Dark
G-Max Move Description: Lowers the Speed of the user and the opponent by 2 stages
Competitive Overview: A dastardly form of speed control in case Malamar goes down that also naturally pairs with Contrary, giving Malamar +2 Speed to help it attempt a sweep
Pokemon: Jirachi
Type of the Gigantamax Form: Steel/Psychic
G-Max Move Name: G-Max Doomsday
G-Max Move Type: Steel
G-Max Move Description: Sets a Doom Desire effect (140 BP Steel-type move that hits the opponent 2 turns later)
Competitive Overview: G-Max Doomsday allows Jirachi to dish out a ton of damage on its 3rd turn of Dynamax, setting whatever effect it needs to whether it's an Attack boost from Max Knuckle or Psychic Terrain from Max Mindstorm while a 140 BP ball of death comes for the current Pokemon at high speeds. Due to the high power of Doom Desire, G-Max Doomsday essentially trades a secondary effect for 4 turns of Max Moves, which can be huge for wallbreaking purposes, especially when it give Jirachi less turns to have to hope for Iron Head flinches.
Subs end later today