With the arrival of The Indigo Disk DLC, we got Terapagos, the mascot legendary of this story. Terapagos has three formes: Normal, Terastal, and Stellar. Normal transform into Terastal automatically upon switch in, so it's unplayable, with Terastal essentially acting as the base forme.
The way Stellar works, however, is unique to it: despite Terapagos terastalizing right as it comes to the field, you can teratalize again and get the new forme, giving you a new ability, changing the behavior of Tera Starstorm, and giving Terapagos +100 BST. In practice, it's very similar to a Mega Evolution, with the biggest difference being the lack of a Mega Stone requirement.
Currently, Terapagos-Stellar and Terapagos-Terastal are stated to not be tiered separated. The main reasons given are that Terastal are a universal mechanic and that you can't ban Terapagos-Stellar on a teambuilder level, just on a gameplay one. This has sparked a lot of discussion on the Metagame Discussion threads (particularly the OU Metagame Discussion), the official Discord, PS! rooms, and basically any other chat related to Smogon, with multiple people voicing their support to tier both formes on their own, and even people who think that it can't be justified out of tiering policy agreeing that they wanted Terapagos-Terastal to be playable on lower tiers if it was possible. Those posts mention things like the fact that Terapagos-Stellar is a completely unique forme on its own, like Mega Evolutions, Ultra Burst, and Power Construct, and precedence of banning those formes over the whole Pokémon on old gens - with the Mega Rayquaza Clause on Ubers being the closest thing we have ever gotten to this. Replies to those arguments include their teambuilding limitation possibility, simplicity of understanding the tiering, and differing tiering policy from Ubers to other usage-based tiers.
Personally, I feel like the separate tiering of Terapagos-Stellar could easily be done, and wanted to spark discussion on a more controlled and focused enviroment.
The way Stellar works, however, is unique to it: despite Terapagos terastalizing right as it comes to the field, you can teratalize again and get the new forme, giving you a new ability, changing the behavior of Tera Starstorm, and giving Terapagos +100 BST. In practice, it's very similar to a Mega Evolution, with the biggest difference being the lack of a Mega Stone requirement.
Currently, Terapagos-Stellar and Terapagos-Terastal are stated to not be tiered separated. The main reasons given are that Terastal are a universal mechanic and that you can't ban Terapagos-Stellar on a teambuilder level, just on a gameplay one. This has sparked a lot of discussion on the Metagame Discussion threads (particularly the OU Metagame Discussion), the official Discord, PS! rooms, and basically any other chat related to Smogon, with multiple people voicing their support to tier both formes on their own, and even people who think that it can't be justified out of tiering policy agreeing that they wanted Terapagos-Terastal to be playable on lower tiers if it was possible. Those posts mention things like the fact that Terapagos-Stellar is a completely unique forme on its own, like Mega Evolutions, Ultra Burst, and Power Construct, and precedence of banning those formes over the whole Pokémon on old gens - with the Mega Rayquaza Clause on Ubers being the closest thing we have ever gotten to this. Replies to those arguments include their teambuilding limitation possibility, simplicity of understanding the tiering, and differing tiering policy from Ubers to other usage-based tiers.
Personally, I feel like the separate tiering of Terapagos-Stellar could easily be done, and wanted to spark discussion on a more controlled and focused enviroment.
- Terapagos-Stellar is a unique forme that's clearly separate from the other Terapagos formes. You can clearly see both on them on the teambuilder, also showing one being Uber and the other not being.
- Terapagos' transformation is not a universal mechanic except by name. If you asked someone to explain Terastalization, they would probably say something among the lines of "it allows you to choose any of the types available in the game, changes your type to match the Tera type, and boosts the power of moves of said type - in the case of Tera Stellar, it provides a smaller boost to every type in the game just once." The universal mechanic of Terastalization does not include a +100 BST, a new ability, a new forme with a different name for your Pokémon, inability to choose your Tera type, and even with it being locked to Tera Stellar, it works differently by having the boost be permanent, not once per type. In fact, if we are to consider held items to be a universal mechanic by that logic, we never banned Gengar, Gengarite, Mega Evolution, or held items, we only banned Mega Gengar, and if we go by name, Terapagos-Normal also terastalizes into Terapagos-Terastal upon entry, but I doubt anyone will claim that a full Tera ban would remove Terapagos-Terastal from being playable since it simply doesn't work like the universal mechanic.
- It's not something that will hurt accessibility. Terapagos-Stellar being banned is as easy to understand as Zygarde-Complete being banned. Let me take Mega Rayquaza's case again, but this is not comparing precedent, it's comparing simplicity. It has been almost a decade since ORAS came out, and the only times I saw people confused about Mega Rayquaza not working are those who didn't know it was on a tier above Ubers - which happens to any Mega if they don't know that. In fact, Mega Rayquaza is probably the most well known Mega Pokémon banned even among casual playerbase - it has never gatekept new players or anything similar.
- Gameplay-level restrictions have happened and will continue to happen. Terastal on Monotype, Dynamax on gen 8, and Mega Rayquaza Clause all are gameplay level restrictions. In fact, when the Terastalization Suspect Test happened, one of the options was "1 Tera user per team (first team slot)". While who gets access is decided on the teambuilder, the restriction itself is clearly on a gameplay level, as the Terastal button remains there for the other 5 Pokémon - you just can't click it. Terapagos-Stellar's restriction is much tamer in comparison to it.
- It avoids unnecessary collateral damage. Terapagos-Terastal on its own is not broken and can be valuable for other tiers by being hazard control on the generation that heavily nerfed it. Even if you think "oh, this will be useless on OU!", what about lower tiers? We originally tiered base formes alongside their Mega Evolutions until there was a Policy Review - this locked out lower tiers from using Pokémon such as Charizard, Beedrill, Aerodactyl, Mawile, Aggron, etc. Despite no one using Mawile on OU for its base forme, just the Mega. You can still have Terapagos-Stellar being used on higher tiers while lowers make use of Terapagos-Terastal, which no one would use on the tier with Stellar.
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