In your case, with an EOS M50 Mark II, all you need to make sure a Godox trigger is compatible is that it's got "X" in its name, and that it's for Canon. So, the XPro-C is compatible with your camera.
Possible versions for the TTL-capable speedlights and triggers that are dedicated to a single camera brand are, from oldest Godox support to newest:
- C (Canon)
- N (Nikon)
- S (Sony)
- O (Olympus/Panasonic micro four-thirds)
- F (Fuji)
- P (Pentax); only for X2T, XPro, R2 Pro II and Xpro II
- L (Leica); only for Xpro II and X3
The Godox X radio system consists of the following gear (at the time I'm writing this):
Strobes
Speedlights: Any Godox unit that's named with a "TT" or "V" that has 2.4 GHz radio in its specs.
All the AD Witstro lights
P2400
AC-powered monolights: Any of the strobe series that have 2.4 GHz in their specs.
Miscellaneous lights
- MF-12 mini macro flashes
- MFR76 C/N/S TTL macro flash and MFR76S+ Sony dental flash
- Lux Master [upcoming]
- FV series CoB LED strobes
- LF308 panel LED strobe
Transmitters
Essentially, you are looking for anything with "X" in the name that has 2.4 GHz in its specs. Compatible transmitters in the system (from oldest to newest) at the time I write this:
- XT16 [manual only]
- XT32 [manual+HSS but Canon only]
- X1T
- XPro
- Flashpoint R2 Pro II [US only; Adorama exclusive]
- X2T
- Flashpoint R2 SPT [US only; Adorama exclusive]
- XPro II
- FusionTLC Raven [allows you to combine TTL/HSS Godox radio gear with similar gear from Profoto, PocketWizard, and Paul Buff].
- X3
Receivers
- X1R. Only comes in Canon, Nikon, and Sony "flavors" for full TTL communication with an OEM TTL/HSS speedlight (3rd party may have more compatibility issues). Becomes a manual trigger for all other camera systems.
- XTR16. Only works with Godox strobes that have a dedicated USB-A port for this this or the 433 MHz FTR16 receiver (e.g., AD180, AD360 (Mark I), and AR400 ring flash). Manual only triggering with M power control by group.
- XTR16s. Only works with Godox speedlights that have the proprietary four-pin connector for it (e.g., V850 (Mark I) and V860 (Mark I). Cannot be used with any other speedlights. Manual-only triggering.
Commonly-mistaken gear that is NOT in the Godox X system
Godox made a 433 MHz radio flash gear before they created 2.4 GHz X system. This system is not compatible with the X system gear. There are a number of Godox units that are not part of the X system. And the X system does not include any radio flash triggers by other brands (e.g., Jinbei (aka Westcott FJ/Rollei HS Freeze), PocketWizard, Profoto, Yongnuo, Neewer Q, Paul C. Buff, Broncolor, or Elinchrom).
- Godox TT560ii/TT520ii (the built-in receiver is 433 MHz)
- Godox TT560 (aka Neewer TT560; no built-in radio)
- Godox Lux Junior, Lux Senior, and Lux Cadet (no built-in radio)
- FT, or CT named radio triggers (433 MHz)
- FC16 (2.4 GHz)
- Cells II (433 MHz)
- AC-powered strobes that are not Mark II or later versions or the MS series (e.g., Mini Pioneers, E series, SK300, etc.). These will not have 2.4 GHz in their specs. The XTR16 receiver can be used, but their ratio power control (e.g., 1/8 power) will not be accurate since these lights can only use decimal control (10.0).
- Neewer Q system. (close enough lookalikes to be mistaken as rebranded Godox).
