How much attack would I have?

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How high would the Attack be after I had a +1 Boost? For example, my Garchomp knows Swords Dance which raises the Attack by +2 and my Garchomp has 358 Attack as his stat and it goes up by 50 when Mega-Evolved, making it 408. Say I Mega Evolved and used Swords Dance, how much would it go up by? 100? And if it is a percentage, what is the percentage of +2? I'd also like to know the percentage of +1 please.
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How attack is calculated in Pokémon?
Namely, it is recognized as a multiplication from a random integer between 85 and 100, inclusive, then divided by 100. STAB is the same-type attack bonus. This is equal to 1.5 if the move's type matches any of the user's types, 2 if the user of the move additionally has Adaptability, and 1 otherwise.How much damage will my Pokémon do?
The Equation That Calculates Damage In Pokemon GODivide the Attack by the Defense. Calculate the Modifier. Multiply 0.5 by the Power, then the result of dividing the Attack from the Defense, and then the Modifier. Add 1 to the result of Step 3 to get the Damage (the number of HP that the opponent will lose)How is Genshin attack calculated?
1 Both Stats Are Equally Powerful Each has its strengths, with lots of special attacks having additional unique effects and physical attacks often having greater damage capabilities. Very few Pokemon are equally powerful in both stats, so having some with each stat is important for having a well-rounded team.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Harrison Haines, Somchai Kongkamsri, Pixabay, @joagbriel