If it's charms you are after, you best go to the Chaos Tunnels, look for the "Giant Crab", that usually drops multiple charms.
Summoning - You have to collect all of the charms via combat and killing monsters. Monsters only drop 1 charm per kill.
When I trained range on fire giants i got like 100 blue charms or more their not likely to appear though that's just one of the monsters that drop them try going to a runescape help site and type in monsters that do drop blue charms.
In Runescape a summoning charm is used with a pouch, shards, and a secondary ingredient at an obelisk to create a pouch. these pouches are then used to summon monsters that can help you with training skills. charms are dropped by hundreds of monsters.here is a link to a better explanation of charms including lists of monsters that drop them.http://runescape.wikia.com/wiki/Charm*note that charms are not tradeable or sold on the grand exchange.
No one in Runescape sells gold charms or any other charms for that matter as they are untradeable, but many monster drop them like ogres by Castle Wars or the monster in the Legend's Dungeon. Do you slayer task you should get lots. Charm drop rate vary from every monsters in Runecape. __ You can receive one free gold charm from "pikkupsticks" in the Taverly summoning store/building.
The Hardest Stat is mainly based off of opinion. Though the one that I think is hard is Summoning. This is because you must kill monsters and have them drop charms, later you combine the charm, a pouch, and some shards. It then turns to a monster pouch that can then be summoned. The problem is that monsters rarely drop charms and a huge supply of them is needed to reach level 99.
Waterfiends are a good option - according to an online guide, about 76% of them drop crimson charms. In any case, if you want charms, I would suggest that: (1) You do slayer tasks, that way you train Slaying as well. Most slayer monsters drop some sort of charm. (2) If you still don't get enough charms (that is, you have 99 Slayer but didn't achieve 99 Summoning yet; or you have the impression that your Summoning level is way behind your Slaying level), kill Bork once a day, to get some extra charms. Ideally, you should do all the Varrock Tasks (all four levels, including Elite); that way, Bork will drop almost twice as many charms.
In summary, it will NOT be fast, whatever you do. Like any skill, it will take some time. Summoning can also be quite expensive. The main method to train Summoning is to kill monsters that drop charms; then use the charms (which are untradeable) to make pouches. Check online guides, for example at runescape.wikia.com, for suggestions about what pouches to make at your current level. I would suggest you do Slayer tasks; that way you also train Slayer and Combat. Most Slayer monsters drop charms. Most Slayer monsters - especially at higher levels - also drop valuable items, i.e., you can earn quite a bit of money with Slayer. This, in turn, can help you buy the items you need to train Summoning. If that doesn't give you enough charms (let's say you get to Slayer level 99 and don't have enough charms for Summoning level 99), you can kill Bork once a day, to get up to 10 blue charms, 17 crimson charms and 5 green charms. (This is the maximum you can get if you did all the Varrock tasks.) Of course, you can also apply any "extra experience" to Summoning (at the cost of NOT applying them to some other skill...). This includes bonuses from the Treasure Hunter activity, the Jack of All Trades aura, penguin points, etc. Also, double experience weekends, if there ever are any (as far as I know, no date has been announced for the next double XP weekend, or whether there even will be one).
Many Monsters drop green charms, two ones that have a decent drop rate for their levels are scorpions and mummies.
Answer: I have provided you with a link below that should bring you the answer(s) that you seek. Answer: Basically you kill monsters that drop them. One good option is the ghouls near Canifis - about 1 of every 4 will drop a gold charm. However, I would recommend you do slayer tasks - that gives you combat experience, slayer experience, and most slayer monsters drop some kind of charms. Not always gold charms - but also the better charms.
all monsters drop goodies except normal rats and spiders
There is a site called Runehq it has everything about Runescape even what monsters drop check it out. : -)
Monsters drop them. As a general rule, higher level monsters drop better things.