We know the TARDIS has a pretty spacious interior, and plenty of rooms we’ve never seen (according to the Doctor, it even has a swimming pool). So perhaps it shouldn’t come as too much of a surprise that it also contains a Pokemon Go gym.
The blue box is currently materialised on a street in west London and is a Level 3 gym defended, obviously, by the blue Pokemon Go team (Mystic) – specifically, by a Lapras (also blue). That puts us in mind of the Skarasen (AKA the Loch Ness Monster), which the Doctor faced during an adventure back in 1975.
Come to think of it, it would be just like the Doctor to tame a prehistoric alien robot and train it as a guard dog… Or perhaps we’re reading too much into this.
Either way, you can find the TARDIS outside Earl’s Court Underground station at the WGS co-ordinates 51.4913°N 0.1947°W – well, for as long as it stays put, that is…