Lewis lung carcinoma derived cell lines such as LL/2 and LLC3 that can form ectopic and orthotropic tumours in female C57/BL6 mice, are frequently used for this purpose. B16 a melanoma derived cell line can also form tumors in the same strain of animal. if you are going to perform tests on human cell lines, you must use immunocompromised animals, such as nude mice.

B16F10 melanoma cell line is the easiest to analyze - just inject 2x105 cells into tail vein of C57BL/6 mouse (syngenic mouse strain to all B16 cell lines), wait 15 days and analyze lungs. Most of the metastases in lungs are dark and very easy to count. Counting is even easier if You use some fixative, e.g., Bouin's fixative as the lungs got very light coloured so the metastases have even better visibility. B16F10 is the best from B16 cell lines as it is the most metastatic one.

I think b16bl6 melanoma or c26 colon are usually used , some labs prepare these cell lines by transfect so they can express sort of fluorescence dye such as luciferase and that make easy to even image or quantify by flour metric method.

Many mouse cancer cell lines were reported to form "metastasis" in lungs after tail i.v. injection to syngeneic mice b16 melanoma and C57BL6 mice are probably one of the most common models. I personally used RenCa cell line with BALB/c mice you can weigh lungs and count focuses of metastasis (to some extent) to estimate metastasis formation and development.

You can sometimes acclimatize cells to metastasize after repeated cycles of grafting, extraction and re-culturing from said organ.

There is some work done with grafting tumors s.c or to the appropriate tissues and checking metastasis “hot” targets such as lungs liver plural fluids etc.

In my opinion these are the best representing models though very difficult to master and perform technically.

Human cancer cells in nude or SCID mice are used in the same manner basically.

If you specify your intention further I could maybe be of better help.