Mithril dragons have a 50% green charm drop rate, dropping four charms each time, which is by far the best. All dragons in general have a fairly good green charm drop rate. The higher level the dragon is, the better change of getting charms. Level 96 cave bugs have an excellent drop rate...considering how weak they are. Cave bugs can be almost as good as mithril dragons, but cave bugs only drop one green charm each time as opposed to the mithril dragons four charm drop each time.
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I would say an Ibis is the best way to level summoning in terms of Shards used and exp given.
if you have a combat of lvl 70+ It it suggested you kill green dragons they make about a mil an hour
There is no "best" auto for runescape. They are all illegal (in the real world) and are against the rules.
The best monster to kill in Runescape would be the King Black Dragon.