Babyjane - Pokémon are little animated 'monsters' that first appeared in the 1990s (I think!) in TV programmes, computer games and merchandise - I think they are a Japanese creation.
Pokémon Go is a mobile phone game - it uses GPS to know where you are, and as you walk in the real world, an animated character (your avatar) walks round in the game world on your phone. You walk round to find Pokémon, spots called 'Pokestops' where you can collect items to allow you to continue the game, and places called 'Gyms' where you can 'battle' other Pokémon (in the game, obviously!). I don't understand the battling, so I don't do it. For me and my friends, the fun is catching the Pokémon and hatching them from eggs (which you do by walking certain distances). There's a certain amount of competition in who has caught the best one - and for those of us who remember Pokémon from the TV programme, we have our favourites that we are really pleased to catch (I would LOVE to catch a Pikachu!).
Cazikins - you're right, it makes absolutely no sense at all! But it's fun, and it's outdoors, and with a bit of common sense there's no harm in it.
![Cheesy :D](https://www.menopausematters.co.uk/forum/Smileys/extended/cheesy.gif)