'Pokemon GO' has introduced three new legendary Pokemon to its game.

Pokemon Go's new legendaries

Pokemon Go's new legendaries

Players across the world now have the chance to get their hands on a further three legendary creatures across the next three months, as developers at Niantic added Raikou, Entei, and Suicune into the game on Thursday (31.08.17).

As of the time of writing, electric type Raikou is available to players in North and South America, fire type Entei is prowling around Europe and Africa, and water type Suicune can be found in Asia and the Pacifics.

The three Pokemon will remain in their regions for the entire month of September, up until September 30 when they will switch regions for the month of October. The regions will change once again on October 31, for a final month of legendary hunting in November.

The move gives each region a whole month to work together in capturing the tough beasts, which will be available to players who complete special Raid Battles which take place at Gym locations across the globe.

Meanwhile, John Hanke, the Chief Executive Officer of Niantic, has admitted to being caught by surprise at the incredible popularity of 'Pokemon GO' after it launched in mid-2016.

He said recently: "We lost probably six months on our schedule because of the success of the game.

"Really all the way through November and December, from launch onward we were rebuilding and rewiring infrastructure just to keep the game running at the scale that we were running at.

"We were fortunate to have a massive launch, a massive success, and many, many more users than we had planned for. But we had to redirect a substantial portion of the engineering team to [work on] infrastructure versus new features.

"That switched off things like extending gyms, it pushed out things we still want to have, like player-versus-player and trading. I'd say we're about six months behind where we thought we would be."