test_left.tex

\documentclass[a4paper,12pt]{article}
%% Well understand input, and nice output
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}

\usepackage{hyperref}
\hypersetup{colorlinks}  % uncomment this line if you prefer colored hyperlinks (e.g., for onscreen viewing)

\usepackage{palatino}

% For graphics / images
\usepackage{graphicx}
\graphicspath{{graphics/}}
\DeclareGraphicsExtensions{.pdf,.eps,.png,.jpg}

%% Easy for loop for LaTeX
% https://stackoverflow.com/a/5958641/
\usepackage{pgffor}

\usepackage[left]{pokemonnumbering}

% Metadata
\title{Pokédex}
\author{Lilian Besson}

\begin{document}

% full title page
\maketitle
\thispagestyle{empty}

\tableofcontents


\pokemonnumbering

% all the Pokémons
% \foreach \n in {1}{
% \foreach \n in {1,...,3}{
\foreach \n in {1,...,151}{
    \input{src/\n.tex}
}

\end{document}