https://www.pokecheck.org/i/mar/c0.gif
https://www.pokecheck.org/i/mar/t0.gif
https://www.pokecheck.org/i/mar/s0.gif
https://www.pokecheck.org/i/mar/e0.gif
https://www.pokecheck.org/i/mar/d0.gif
https://www.pokecheck.org/i/mar/c1.gif
https://www.pokecheck.org/i/mar/t1.gif
https://www.pokecheck.org/i/mar/s1.gif
https://www.pokecheck.org/i/mar/e1.gif
https://www.pokecheck.org/i/mar/d1.gif
I fixed the links for you, you forgot the / between .org and i