Legendary Pokemon are considered as the hard hitting,bulky and fearing pokemon both in Anime and Games 

With addition of Mega Evolution Some of them became broken because of it's unique Abilities, strong Stats and Strong Move set.

Here are top 5 Strongest Legendary Pokémons of all time.

5. Deoxys

Deoxys is in this list because of it's unique Ability to change it self into 3 different forms.

#Attack Form

#Speed Form

#Defense Form

This legendary Pokemon can change into any of the three form at any time at will, Each of it's form has one of the highest stats on the “Speed(180), Atk.(180) ,S.atk.(180) , Def.(160) And S.def.(170)

It will be very tough to take down this legendary Pokemon on battle.

4. Mega Mewtwo Y

Mega Mewtwo Y being slightly Stronger than it's alternative form( Mega Mewtwo X) is on no.4 of our list

With it's extra Impressive S.atk stats(195) and speed stats 140)

And it's signature move (Psysrike)

It will sweep away it's opponent before Noticed.

3. Mega Rayquaza

Mega Rayquaza is in this list because of it's ability “Delta Stream and the ability to mega evolve without any mega stone”

Being Flying & Dragon type the most obvious way to defeat this overpowered Beast is by using numbers ofstrong Ice type move. Which is ×4 times effective on it.

But after it gains it's mega form. The ability “Delta Stream” prevents it from getting 4 times effective.

Also with ability to mega evolve after using move "Dragon Ascent" gives it an extra slot for items to Increase it's attack power and with move like "Dragon Dance" boosting it's atk and speed.

It is a Beastly pokemon.

2. Eternamax Eternatus

This Pokemon is unarguably one of  the most broken pokemon ever existed

With recent releases of new Region in Pokemon , Eternamax Eternatus was released with the base Stats of (1125)

Almost Double to that of other legendary Pokemon in the List.

There is nothing more to explain about this Overwhelming overpowered beast.

1. Arceus

The Obvious choice  and undoubtedly  the Strongest Legendary Pokémons

There is a reason why Arceus is known as god of pokemon. With it's Ability "Multitype" and Perfect balance of all it's stats(120 each) this Indefitable Pokemon literally has no Weakness.

Arceus can change to any of the know type to take least damage or no damage at all, Arceus can also learn moves to Power up it's Offense and Defense.

Arceus is Undoubtedly the most Broken pokemon in the History of Pokemon franchise.