1-ice badge: seel,?,?,?,alola ninetales,alola sandslash 2-water badge: ?,?,?,?,?,? 3-electric badge: ?,?,?,?,?,magenton 4-grass badge: ?,?,?,?,?,? 5-poison/ghost badge: nidoqueen,muk,weezing,haunter,nidoking,gengar 6-normal/ground badge: rhydon,chansey,snorlax,dugtrio,?,?(thanks to AlmightyPiLord) 7-fire badge: ?,?,?,?,?,? 8.-psychic badge: ?,?,?,?,?,?
Normal/ground has a Rhydon, Chansey, Snorlax, and Dugtrio. There's two more, but I can't quite remember. Also, Fire has an Arcanine and Moltres along with 4 others I forgot.Thanks for making this post, in sure it'll help a lot of people once it's complete!
If this is for survival, Workbenth already made a guide for that. Here it is; http://forum.pokefind.co/index.php?threads/pokémon-survival-gym-guide.15458/
That is up to you. In my opinion, it is better if we only have one so there is no confusion. If you want to you can of course try and make an updated, more detailed version of it. For example, add in cords as it is not always easy to find the gym you are looking for. I recommend that you go through the latest post though before you make a post similar to another ;P Have a good day!