Origin
Arceus is particularly based on a
creator deity, present in many world cultures. Arceus's stance and general form are similar to Egyptian bull and calf idols, particularly
Apis. Based on its appearance and attack movements in the 3D games, Arceus may be modeled after a
horse or
llama. The arc on its back may be inspired by the
Dharmachakra, or the
Bhavacakra, used to represent a concept similar to the reincarnation in
Hinduism.
The conception of the first god might be influenced by the
Shinto gods
Kunitokotachi and
Amenominakanushi, who summoned
Izanami and
Izanagi to create Japan with the spear. It may also be a reference to the
qilin, a Chinese mythical creature. Its myth is nearly identical to the
Cosmic egg, found in creation myths of many cultures and civilizations. Arceus may also represent or be inspired by the
bodhisattva Avalokiteśvara, who, in
Buddhism, is either pictured with eleven heads and one thousand arms (the latter of which is mentioned in Arceus's Pokédex entry) or in a
white, four-armed manifestation (which could look similar to Normal-type Arceus).
And yes I just copied this from Bulbapedia because I was too lazy to write it all out.