First, the meta is largely determined by the current legendary, so what are you using? Gyms? Future legendaries? Legacy bosses? In all cases, psychic should move down, it is only usefull against machamp and gengar, and there is no legendary in the first three gens weak to it. Ghost should move way up, usefull against gengar, alakazam, mewtwo, lugia, jynx, claydol, latios, latias.Ice should also move down because there are no really strong ice types. They only got to shine against rayquaza, but against anything else there are much better options. Rock has been very usefull in the past with moltres, ho-oh, entei, arcanine and ninetales, and if those come back it will shine again. I think grass should move up a little bit. It was good against suicune, kyogre and vaporeon, and will again be against regirock.
Rank of meta-relevant types
This ranking doesn't focus at the current legendary raid at all. I'm trying to make an all round rank of meta-relevant types. However, I made this list in about 5 minutes, so there could be mistakes:
1. Fighting
2. Dragon
3. Psychic
4. Ice
5. Dark
6. Water
7. Electric
8. Fire
9. Ghost
10. Bug
11. Rock
12. Fairy
13. Steel
14. Normal
15. Ground
16. Poison
17. Grass
18. Flying
i.e: I have ignored Groudon and Lugia because the difference of power between these 2 and the other Ground or Flying Pokémon is very huge.
Answers
Sorry for the mistake,. But what I meant was, I didn't want the list to be determined by the current legendary 'only'. I wanted all factors to work here. Like, I've put Ice high up in the list because a lot of the current and future legendary and pseudo-legendary pokemon are Dragon types. I was trying to make a list somewhat like, "What if all Pokémon family were raid bosses!" And gym attacking is a factor as well. Psychic is very high because it is a narrowly resisted attacking type and a lot of Psychic type Pokémon have very high base attack (ex- Mewtwo, Alakazam, Espeon). Rock is very low because there is only one Rock type fast move in the game. Rock will be very much useful when Smack Down, Rollout, Head Smash arrives in the game. Well, as I said, I didn't take much time for making this list. If you disagree, that's fine. Make one of your own. The more accepted list will be the best.
The problem with Ice ranking is the the Attack stat of Ice types is so low that without the Double Weakness that Flying/Dragon has to ice it won't be as useful.
Going a step farther, your logic runs into issues with Ice vs Fairy.
I get that Fairy has no quick move. But it has 2 Double Resistence to Dragon that Ice lacks.
I feel like you are underestimating rock grass and ground type(because earthquake is bad), and overestimating ice ghost psychic and water to a degree. But it all comes down to playing style and somehow biome dependant. Before waterfall I almost never used water type for example Golems and Venusaur did the job. Didnt really use Kyogre as well. Ice only shined against double weakness. Psychic only shined against Machamp raids as well
