They are a variety of things you can use at 70 Ranged;
If you have the time I would suggest getting Void Armour as it gives 15% bonuse in range. And is VERY accurate. However, for the impatience people I woudl use the following;
Body
Black D'hide Body
Black D'hide Chaps
Foot
Snakeskin Boots/Ranger Boots
Helmlet/Head
Robin Hood Hat/Slayer Helmet/Black D'hide Coif
Amulet/Neck
Amulet of Ranging
Amulet of Fury
Amulet of Power
Cape/Back
Ava's Accuamlator
Team Cape
Fire Cape
Red Cape/Blue Cape
Or any other cape you want.
Deffientley try and use AVA'S ACCUMLATOR you will save yourself time.
If you need any help In-Game on Runescape, please feel free to add; Joshmckeithh or 12 mining1. Thankyou.
Dragon Bolts (e) are the most effective, however you can use Diamond Bolts (e)
lv 48
Mewtwo is at Level 70 when you battle him. You should most likely use you highest level Pokemon that is around level 70.
i recently fought them i think 70-82 somewhere in that range
Your combat level is also dependant on your hitpoints, prayer, range, magic and summoning level. Assuming you had 70 attack, strength and defence, with 10 hitpoints (the lowest level you can have) and the rest of the skills mentioned above at level 1, you would have a combat level of 65. If however you had 70 hitpoints as well, you would be a level 80 combat.
it depends on your range level and what your training on, i cant say exactly what amount
70
A suggestion to get to level 70 is:1-10 Use a sling on goblins in Lumbridge10-20 Level 5 goblins outside of the Grand Exchange and next to Edgeville dungeon which you need brass key for.20-30 Barbarian Village30-40 Hill Giants40-50 Level 30 zombies, level 28 Creepy Crawlers, or level 40 zombies at Stronghold of Security50-70 Level 58 Ice Giants and level 56 Ice Warriors
Range high 50's and 60's close 70's.
Go deep into cerulean cave it'll be level 70 use over level 70 the item to catch is master ball HOPE THIS HELPS
You probally want to use it on mewtwo because it is level 70
You can the highest you can get any skill in Runescape is 99. And the highest combat level you can get is 138.