How do i get Lvl 4-5 Charms?

[Spada]

Like Attack boost or Challanger?

[monrebauz]

upgrade the old attack charm thats it

[JPM岩]

Upgrades. Most parts are from the Guiding Lands.

[Nerevar]

youll need the base version of the charm and then just upgrade it.
agi 5 charm requires the reactor from raging brachydios (meldable with print)
attack 5 charm requires KT master rank mantle. (not meldable as of yet so kulve needs to be active in order to get this)

both require an GSG (mr 100 ONLY. no way to get it before mr 100) and 1 shadowcore aswell (tempered elders ONLY. aka mr 100 aswell)

[Papah]

For Attack Charm IV you need to slay Ruiner Nergigante, as for Attack Charm V you need to hunt Silver Rathalos or Gold Rathian, also get the Golden Dragonsphire from MR Kulve

Etc. Etc.