There are 7 stats in total which include:

• Hit Points (HP): Determines the amount of health that a Temtem has. When the HP of any Temtem reaches zero during combat, it is considered exhausted and cannot fight anymore.
  
• Stamina (STA): Determines how many techniques a Temtem can perform during battle. If the Stamina bar is completely drained, using techniques will cause the user to take self-damage due to Overexertion. Temtems recover a small amount of Stamina at the end of every turn, but can also be ordered to Rest, recovering even more Stamina while performing no Technique for that turn.
  
• Speed (SPD): Determines the order in which Temtems will use techniques in a turn.
  
• Attack (ATK): The Temtem's power using Physical Techniques.
  
• Special Attack (SPATK): The Temtem's power using Special Techniques.
  
• Defense (DEF): The Temtem's endurance when receiving a Physical Technique.
  
• Special Defense (SPDEF): The Temtem's endurance when receiving a Special Technique.

Whenever a Temtem levels up, their different stats grow independently from one another and according to a formula that depends on three factors: Base Stats, Training Values (TVs) and Single Values (SVs). Stat totals are the outcome of all three of these stats combined. Lets talk about them.

The Base Stats of a Temtem are unique for each species, and are the main factor when determining how a specific stat will grow when leveling. Whenever a Temtem evolves, its Base Stats also change, which usually means that the Temtem gets stronger.

It is the equivalent of Individual Value (IV) in Pokémon. It represents the quality of each of the 7 attributes of your Temtem. They are uncontrollable factors that cannot be changed under any conditions, ranging in value between 1 and 50. The closer to 50, the greater the attribute of your Temtem (stronger). SVs are determined the moment you capture a Tem or it is born. By the crossover method, there are ways to manipulate the puppy's SVs based on the parent's SVs, but in general it takes luck to have a Temtem with high SVs. A Temtem with 50 of all SVs is considered perfect. Luma Temtem always have three maxed out SVs. Starter Temtem have fixed SVs. High stats appear in green, low stats in red.

Take a look at a Skail with one SV:

It is the equivalent of Effort Value (EV) in Pokémon. It is a controllable value that increases the attributes of your Temtem, added to the SVs. Training Values are given to the Temtem in one of two ways: beating wild Temtem (either by knockout or capture) or by feeding your Temtem special fruit items. The latter option also allows you to decreases your Temtems TV as well. At most you can have 1000 TVs distributed among the 7 attributes, and a maximum of 500 TVs in a single attribute. It is basically an extra in the attributes of your Temtem. Having 50 SV and 500 TV in the defense attribute, for example, guarantees the highest possible defense value that your Temtem can have.

For example:

Level 50:
HP - each 8 TV = +1 HP
STA - each 20 TV = +1 STA
SPD - each 10 TV = +1 SPD
ATK - each 10 TV = +1 ATK
DEF - each 10 TV = +1 DEF
SATK - each 10 TV = +1 SATK
SDEF - each 10 TV = +1 SDEF

Level 100:
HP - each 4 TV = +1 HP
STA - each 10 TV = +1 STA
SPD - each 5 TV = +1 SPD
ATK - each 5 TV = +1 ATK
DEF - each 5 TV = +1 DEF
SATK - each 5 TV = +1 SATK
SDEF - each 5 TV = +1 SDEF

Do you want the perfect TV por each Temtem? Take a look, there you can see what TV a temtem drops to yours when joinning the battle: https://temtemstrat.com/en/resource/list-tv-yield-temtem

A Temtem's Stat Total is the culmination of the three components mentioned above (Base, SV and TV). These are the actual numbers used in calculations during battle.

In battle, a Temtem's offensive, defensive and speed stats may be raised or lowered as an effect of different techniques by up to 4 stages. This cannot be altered by switching out the affected Temtem.

• Raised Stats - Gain an additional 50% of their initial value per stage, meaning they can be boosted by 50% / 100% / 150% / 200% when raised by 1 / 2 / 3 / 4 stages, respectively.
  
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• Lowered Stats - Are lowered by an increasing factor per stage. A lowered stat will become 67% / 50% / 40% / 33% of its initial value when lowered by 1 / 2 / 3 / 4 stages, respectively.